Fixes #23880: Add new policy conditions isReviewer() and !isReviewer

[qiyingshao]

Describe your changes:

Fixes #23880

I worked on adding a new policy condition isReviewer() (and its negation !isReviewer) because there was previously no way to check if a user is listed as a reviewer of an entity during policy evaluation.
This condition helps improve access control flexibility which is similar to isOwner() but applied to the reviewers field.

I tested my changes by:

• Adding unit tests in SubjectContextTest.java to verify that isReviewer() and !isReviewer() return correct results.
• Adding unit tests in RuleEvaluatorTest.java to ensure reviewer-based conditions are properly evaluated during policy execution.
• Adding unit tests in ElasticSearchRBACConditionEvaluatorTest.java to verify that reviewer-based conditions are correctly translated into Elasticsearch queries.
• Running all existing and new tests to confirm there are no regressions.

Type of change:

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• I have read the CONTRIBUTING document.
• My PR title is Fixes <issue-number>: <short explanation>
• I have commented on my code, particularly in hard-to-understand areas.
• For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

New feature

• The issue properly describes why the new feature is needed, what's the goal, and how we are building it. Any discussion
  or decision-making process is reflected in the issue.
• I have updated the documentation.
• I have added tests around the new logic.

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
will start executing and we'll be able to make sure everything is working as expected.

Let us know if you need any help!

[github-actions]

The Java checkstyle failed.

Please run mvn spotless:apply in the root of your repository and commit the changes to this PR.
You can also use pre-commit to automate the Java code formatting.

You can install the pre-commit hooks with make install_test precommit_install.

[sonarqubecloud]

Quality Gate passed for 'open-metadata-ingestion'

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud