ci(generation): skip files inheriting coordinates in release check

[meltsufin]

Fixes #12840

[gemini-code-assist]

Code Review

This pull request updates the check_existing_release_versions.sh script to skip POM files that lack explicit group_id or version declarations, treating them as inheriting coordinates rather than errors. Feedback suggests reordering the validation logic to ensure the mandatory artifact_id is checked first, preventing the script from incorrectly skipping malformed files, and improving the formatting of error messages.