[BugFix] Make cpu_weight always store positive default value

[ZiheLiu]

Why I'm doing:

Recently, a change was made allowing the resource parameter cpu_weight, which previously had to be positive, to now be non-positive.

After downgrading from current version, since the old version of BE expects cpu_weight to be positive (e.g., using it as a divisor), this could lead to crashes or unexpected behavior.

What I'm doing:

To address this, ensure that when a resource group is persisted, the stored value is always a positive integer.

Additionally, when using the value, the getNormalizedCpuWeight() method will ensure that cpu_weight returns 0 when exclusive_cpu_cores is positive.

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

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 13 / 13 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/sql/ast/AlterResourceGroupStmt.java	1	1	100.00%	[]
🔵	com/starrocks/catalog/ResourceGroup.java	7	7	100.00%	[]
🔵	com/starrocks/sql/ast/CreateResourceGroupStmt.java	1	1	100.00%	[]
🔵	com/starrocks/catalog/ResourceGroupMgr.java	4	4	100.00%	[]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

@Mergifyio backport branch-3.3

[mergify]

backport branch-3.3

✅ Backports have been created

• Backport to branch branch-3.3 not needed, change already in branch branch-3.3