fix: revert "Feat: Record serialization/deserialization"

[milaGGL]

This PR is resulting to java cloud bom failure. Reverting the change back till we fixed the java version conflict.

BEGIN_COMMIT_OVERRIDE
fix: revert "Feat: Record serialization/deserialization"
END_COMMIT_OVERRIDE

[suztomo]

When merging this pull request ensure you have "fix:" in the prefix in the commit message. This will ensure the fix will appear in the release note.

[milaGGL]

When merging this pull request ensure you have "fix:" in the prefix in the commit message. This will ensure the fix will appear in the release note.

The feature is supposed to be released in this cycle. can we remove it completely from release note, instead of having 2 note: added this feature, fix it by removing it?

[ldetmer]

When merging this pull request ensure you have "fix:" in the prefix in the commit message. This will ensure the fix will appear in the release note.

The feature is supposed to be released in this cycle. can we remove it completely from release note, instead of having 2 note: added this feature, fix it by removing it?

I can manually update release notes to remove this

[suztomo]

I can manually update release notes to remove this

Yes, that works.

[suztomo]

clirr check failed https://github.com/googleapis/java-firestore/actions/runs/10927804193/job/30335326929?pr=1833

8001: com.google.cloud.firestore.encoding.CustomClassMapper: Class com.google.cloud.firestore.encoding.CustomClassMapper removed

I marked the check as non-required temporarily.