Revert v3 compliance work

[pzl]

Change Summary

Turn main branch back into a publishable state

• This reverts commit 7e59c92 ( PR Revert "Revert "Transform schema v2 (#270)" (#411)" #418)
• This reverts commit cf54cde (PR object_type: keyword #443)
• This reverts commit 0d1065c (PR Enable Unattended Transforms #447)

A new working branch with this changeset will be created, and won't be merged back to main until sufficient kibana testing is done and passing

Release Target

N/A

Q/A

For mapping changes:

• I ran make after making the schema changes, and committed all changes
• If this is a metadata change, I also updated both transform destination schemas to match

For Transform changes:

• The new transform successfully starts in Kibana
• The corresponding transform destination schema was updated if necessary

[elasticmachine]

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• Start Time: 2023-12-12T21:28:01.276+0000

• Duration: 7 min 29 sec

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