Cherrypick iceberg autosharding

[ahmedabu98]

Cherrypicking #32612

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers

[Abacn]

this cherry pick has different diff than the original PR, could you please simply run git cherry-pick d84cfffd017342542cc1dc3e7ae30452a485e3b1 on release-2.60.0 branch and push to the PR?

[ahmedabu98]

I think the only missing change is to .github/trigger_files/IO_Iceberg_Integration_Tests.json:

but an identical change has already been committed (probably from #32621): https://github.com/apache/beam/blob/release-2.60.0/.github/trigger_files/IO_Iceberg_Integration_Tests.json

[Abacn]

sorry if not clear, git cherry-pick ... will give a single commit to this PR, currently there are 9 commits. But on the master branch history the original PR merged into a single commit (d84cfff)

[ahmedabu98]

I see. Let's move to #32663 then