Update/dont sync set object terms action for blacklisted taxonomies

[darssen]

Fixes https://github.com/Automattic/vulcan/issues/668
Full sync for post actions is not using the terms since D37014-code, we should not fetch it and send it.

Proposed changes:

• Send an empty array but keep the structure intact so that we don't need to change wpcom processing.
• Changed the name of the hook since add_term_relationships is not correct anymore and also used the same name as other modules the same we did in Full sync: Set chunk size of Woo modules dynamically #41433. Ideally build_full_sync_action_array should be moved to the parent class (module)

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Testing instructions:

• After deleting posts in your wpcom cached site, run a full sync for posts and check that things are working as expected.

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

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• To test on Simple, run the following command on your sandbox:

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  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/dont-sync-set-object-terms-action-for-blacklisted-taxonomies
  

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[github-actions]

Code Coverage Summary

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[fgiannar]

Thanks for the cleanup, Juanma!

I left an inline comment around a typo in _deprecated_function ans since I missed that while reviewing #41433 I was wondering if we could fix those ones too.

[fgiannar]

Suggested change

	_deprecated_function( __METHOD__, 'next-version' );
	_deprecated_function( __METHOD__, '$$next-version$$' );

I think this is how we are supposed to use next-version. Btw missed that with #41433 could we fix it real quick?

[fgiannar]

LGTM 🚢