feat(queries): fix redundant existence check regal lint issue

[ArturRibeiro-CX]

Fix redundant existence check regal lint issue

This PR resolves a Regal lint warning related to redundant existence checks by removing unnecessary references that are immediately used in the next expression. Since Rego already evaluates whether a value is defined before using it, these checks serve no purpose and have been removed to improve clarity and maintainability.

Reason for Proposed Changes

• Ensure compliance with Regal Linter’s redundant-existence-check rule;
• Eliminate unnecessary checks that do not affect logic but reduce readability;
• Improve efficiency by allowing Rego’s natural evaluation order to handle undefined values.

Proposed Changes

• Removed explicit existence checks where the value is directly used in the next expression;
• Simplified conditions to avoid redundant evaluations;
• Ensured the affected policy files pass Regal Linter without redundant-existence-check warnings.

Continuation of #7295

I submit this contribution under the Apache-2.0 license.

[github-actions]

KICS version: v2.1.5

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