fix(ibm-api-symmetry): improve validation logic to avoid false positives

[padamstx]

PR summary

This PR fixes the ibm-api-symmetry rule to avoid false positives.

PR Checklist

General checklist

Please make sure that your PR fulfills the following requirements:

• [ ] The commit message follows the Angular Commit Message Guidelines.
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)
• [ ] Dependencies have been updated as needed
• [ ] .secrets.baseline updated as needed?

Checklist for adding a new validation rule:

• [ ] Added new validation rule definition (packages/ruleset/src/rules/*.js, index.js)
• [ ] If necessary, added new validation rule implementation (packages/ruleset/src/functions/*.js, updated index.js)
• [ ] Added new rule to default configuration (packages/ruleset/src/ibm-oas.js)
• [ ] Added tests for new rule (packages/ruleset/test/*.test.js)
• [ ] Added docs for new rule (docs/ibm-cloud-rules.md)

[ibm-devx-sdk]

:tada: This PR is included in version 1.15.7 :tada:

The release is available on npm package (@latest dist-tag)

Your semantic-release bot :package::rocket:

[ibm-devx-sdk]

:tada: This PR is included in version 1.16.8 :tada:

The release is available on npm package (@latest dist-tag)

Your semantic-release bot :package::rocket: