Fix the backfill script

[lukaszgryglicki]

cc @mlehotskylf @ahmedomosanya - fix the issue with actual AWS update that wasn't detected in dry-run mode. No logic updates.

Signed-off-by: Lukasz Gryglicki lgryglicki@cncf.io

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Pull request overview

This PR fixes a critical bug in the DynamoDB backfill script where condition expressions referenced attribute names that weren't part of the update operation, causing validation errors during actual AWS updates that weren't detected in dry-run mode.

Key Changes:

• Introduced dynamic condition expression building based on fields being updated
• Changed attribute name maps from pre-populated to conditionally populated
• Added new buildConditionExpression function to generate condition expressions that only reference attribute names actually being set