[Enhancement] Add max_tablet_rowset_num metrcis (backport #36539)

[mergify]

This is an automatic backport of pull request #36539 done by Mergify.
Cherry-pick of 555dfa6 has failed:

On branch mergify/bp/branch-2.5/pr-36539
Your branch is up to date with 'origin/branch-2.5'.

You are currently cherry-picking commit 555dfa65b1.
  (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:   be/src/storage/tablet_manager.cpp
	modified:   be/src/util/starrocks_metrics.h

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   be/src/util/starrocks_metrics.cpp

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

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[mergify]

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

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

❌ fail : 1 / 4 (25.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	src/storage/tablet_manager.cpp	0	3	00.00%	[899, 914, 915]
🔵	src/util/starrocks_metrics.cpp	1	1	100.00%	[]