[BugFix] Fix incorrect materialized view row count (backport #51944)

[mergify]

Why I'm doing:

Fix incorrect mv row count which introduced in #50668

What I'm doing:

The MaterializedIndex object is different in every physicalPartition, but with the same index.getId(), so the indexRowCountMap.put(index.getId(), indexRowCount) will overwrite previous mv partition's row count with the later partition's row count

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.

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 #51944 done by [Mergify](https://mergify.com). ## Why I'm doing: Fix incorrect mv row count which introduced in #50668 ## What I'm doing:

The MaterializedIndex object is different in every physicalPartition, but with the same index.getId(), so the indexRowCountMap.put(index.getId(), indexRowCount) will overwrite previous mv partition's row count with the later partition's row count

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.

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 1df36e4 has failed:

On branch mergify/bp/branch-3.2/pr-51944
Your branch is up to date with 'origin/branch-3.2'.

You are currently cherry-picking commit 1df36e49d4.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   fe/fe-core/src/main/java/com/starrocks/catalog/TabletStatMgr.java

no changes added to commit (use "git add" and/or "git commit -a")

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