[Enhancement] auto change replication_num of system tables (backport #51799)

[mergify]

Why I'm doing:

When scale-in the cluster from 3 nodes to 1 node:

• Since the system tables in _statistics_ database will have 3 replicas, they would stop the scale-in
• The current solution is to drop this database and recreate it, but which is not safe actually

What I'm doing:

Auto change replication_num of several system tables

• When scaling out to more than 3 nodes, change the replication_num to 3
• When scaling in to 1 node, change the replication_num to 1, otherwise scale-in would never succeed

Affected system tables:

• column_statistics
• histogram_statistics
• table_statistic_v1
• external_column_statistics
• external_histogram_statistics
• 3.2: pipe_file_list
• 3.3: loads_history
• 3.3: task_run_history

Behavior change:

• before: the replication_num will only be increased but not decreased
• now: the replication_num will be increased when scale-out, and decreased when scale-in

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

---

This is an automatic backport of pull request #51799 done by [Mergify](https://mergify.com). ## Why I'm doing:

When scale-in the cluster from 3 nodes to 1 node:

• Since the system tables in _statistics_ database will have 3 replicas, they would stop the scale-in
• The current solution is to drop this database and recreate it, but which is not safe actually

What I'm doing:

Auto change replication_num of several system tables

• When scaling out to more than 3 nodes, change the replication_num to 3
• When scaling in to 1 node, change the replication_num to 1, otherwise scale-in would never succeed

Affected system tables:

• column_statistics
• histogram_statistics
• table_statistic_v1
• external_column_statistics
• external_histogram_statistics
• 3.2: pipe_file_list
• 3.3: loads_history
• 3.3: task_run_history

Behavior change:

• before: the replication_num will only be increased but not decreased
• now: the replication_num will be increased when scale-out, and decreased when scale-in

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

[mergify]

Cherry-pick of 0c0ea45 has failed:

On branch mergify/bp/branch-3.3/pr-51799
Your branch is up to date with 'origin/branch-3.3'.

You are currently cherry-picking commit 0c0ea45ed1.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   fe/fe-core/src/main/java/com/starrocks/load/pipe/filelist/FileListTableRepo.java
	modified:   fe/fe-core/src/main/java/com/starrocks/scheduler/history/TableKeeper.java
	modified:   fe/fe-core/src/main/java/com/starrocks/scheduler/history/TaskRunHistoryTable.java
	modified:   fe/fe-core/src/main/java/com/starrocks/statistic/StatisticUtils.java
	modified:   fe/fe-core/src/main/java/com/starrocks/system/SystemInfoService.java
	modified:   fe/fe-core/src/test/java/com/starrocks/load/pipe/filelist/FileListRepoTest.java
	modified:   fe/fe-core/src/test/java/com/starrocks/scheduler/history/TaskRunHistoryTest.java
	new file:   fe/fe-core/src/test/java/com/starrocks/statistic/StatisticUtilsTest.java

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   fe/fe-core/src/main/java/com/starrocks/load/loadv2/LoadsHistorySyncer.java
	both modified:   fe/fe-core/src/main/java/com/starrocks/load/pipe/filelist/RepoCreator.java
	both modified:   fe/fe-core/src/main/java/com/starrocks/statistic/StatisticsMetaManager.java

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

@mergify[bot]: Backport conflict, please reslove the conflict and resubmit the pr