feat(queries): fix use in operator regal lint issue

[cx-artur-ribeiro]

Fix use in operator regal lint issue

This PR replaces manual membership checks with the in operator in Rego files. This change improves code clarity, reduces the risk of logical errors, and enhances readability, especially when checking if a value is part of a collection.

Reason for Proposed Changes

• Ensure compliance with Regal Linter’s use-in-operator rule;
• Improve readability and maintainability by using the in operator for membership checks;
• Reduce potential errors by making membership conditions more explicit.

Proposed Changes

• Replace manual membership checks (e.g., x != []) with the in operator (e.g., x not in []);
• Apply this change consistently across all affected Rego files;
• Ensure all affected files pass Regal Linter without use-in-operator warnings.

Continuation of #7295

I submit this contribution under the Apache-2.0 license.

[github-actions]

KICS version: v2.1.4

Category Results CRITICAL 0 HIGH 0 MEDIUM 0 LOW 0 INFO 0 TRACE 0 TOTAL 0	Metric Values Files scanned 1 Files parsed 1 Files failed to scan 0 Total executed queries 47 Queries failed to execute 0 Execution time 0