[improve][test]Add new test PartitionCreationTest.testGetPoliciesIfPartitionsNotCreated

[poorbarcode]

Motivation

branch-4.0 has such an issue, which occurs as follows. I have pushed a PR to fix it #24680

• Create a partitioned topic with 2 partitions
• All partitions are deleted because the feature brokerDeleteInactiveTopicsEnabled is true
• Try to get the topic-level policies; you will get a Topic not found error

The master branch does not have the issue because #24225 have fixed it here

This PR is in order to add the same test as #24680

Modifications

Add a new test PartitionCreationTest.testGetPoliciesIfPartitionsNotCreated

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: x

[poorbarcode]

/pulsarbot rerun-failure-checks

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.20%. Comparing base (490ba0c) to head (4e8d439).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #24681       +/-   ##
=============================================
+ Coverage     38.72%   74.20%   +35.47%     
- Complexity    13076    33383    +20307     
=============================================
  Files          1836     1893       +57     
  Lines        143697   147772     +4075     
  Branches      16616    17089      +473     
=============================================
+ Hits          55650   109655    +54005     
+ Misses        80600    29360    -51240     
- Partials       7447     8757     +1310     

Flag	Coverage Δ
inttests	26.56% <ø> (-0.08%)	⬇️
systests	22.73% <ø> (+0.01%)	⬆️
unittests	73.69% <ø> (+39.04%)	⬆️

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see 1391 files with indirect coverage changes

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