Issue #9675: [Remote Store] Add negative test cases and improve cluster stability validation in RemoteStoreRepositoryRegistrationIT

[night-owl-1709]

Description

This PR adds comprehensive negative test cases to RemoteStoreRepositoryRegistrationIT to improve test coverage for remote store functionality. The added tests verify proper error handling and validation during node join scenarios that should fail.

Added Test Cases:

1. testNodeJoinFailureWithDifferentRemoteStoreRepositoryAttributes - Tests incompatible remote store configurations
2. testNodeRejoinFailureWithChangedRemoteStoreAttributes - Tests node rejoin failure with changed attributes
3. testNodeJoinFailureWithMissingRemoteStoreAttributes - Tests missing remote store attributes
4. testRepositoryVerificationFailureDuringNodeJoin - Tests repository verification failure with invalid repository types

These negative test cases enhance the robustness of remote store functionality by ensuring proper validation and error handling during cluster formation and node lifecycle operations.

Related Issues

Implements 4 negative scenarios for #9675

Check List

• Functionality includes testing.
• API changes companion pull request [created](https://github.com/opensearch-project/opensearch-api-specification/blob/main/DEVELOPER_GUIDE.md), if applicable.
• Public documentation issue/PR [created](https://github.com/opensearch-project/documentation-website/issues/new/choose), if applicable.

Notes:

• No API changes were made (only added test cases)
• No public documentation needed (internal test improvements)
• All changes are test-only additions to improve coverage

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

❌ Gradle check result for 92f7517: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for ee58d5d: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for ee135ee: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for ce36fc9: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 703048c: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.83%. Comparing base (9b22c9b) to head (c20cbcd).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #18860      +/-   ##
============================================
+ Coverage     72.77%   72.83%   +0.06%     
- Complexity    68690    68833     +143     
============================================
  Files          5582     5587       +5     
  Lines        315456   315719     +263     
  Branches      45778    45817      +39     
============================================
+ Hits         229568   229955     +387     
+ Misses        67290    67173     -117     
+ Partials      18598    18591       -7     

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[linuxpi]

Thanks for raising the PR @night-owl-1709 ! Are you planning to cover all the test cases mentioned in #9675 ?

If not, we can just check mark the ones you cover in this PR and keep the issue open

[github-actions]

✅ Gradle check result for c20cbcd: SUCCESS