Add CHANGES.md note for BigQueryEnrichmentHandler duplicate-key batch fix

[prabhnoor0212]

What this PR does

Adds a follow-up entry for the recently merged BigQuery enrichment handler fix

Why

A reviewer requested a follow-up change to document the fix in release notes.

Context

Follow-up to the merged PR that fixed duplicate-key handling in batch mode.

Ref: #38040

[gemini-code-assist]

Summary of Changes

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This pull request updates the project's changelog to ensure that a previously merged fix regarding duplicate-key handling in the BigQuery enrichment handler is properly documented for users.

Highlights

• Documentation Update: Added a new entry to the CHANGES.md file to document the recent fix for BigQueryEnrichmentHandler in batch mode.

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[tvalentyn]

this should go to 2.74, since we already cut the 2.73.0 release branch earlier this week.

[tvalentyn]

i took care of this.

[tvalentyn]

r: @tvalentyn

[github-actions]

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