Add WordAds WoA post transfer action

[cphilleo]

Proposed changes:

• Adds an action to WoA post-transfer to activate the Jetpack WordAds module if the pre-transfer site was enrolled in WordAds.

Testing instructions:

• Initiate a transfer for a site enrolled in WordAds
• After transfer, verify that the WordAds Jetpack module is activated

Does this pull request change what data or activity we track or use?

No

[github-actions]

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[github-actions]

This PR has been marked as stale. This happened because:

• It has been inactive for the past 3 months.
• It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, etc.

If this PR is still useful, please do a [trunk merge or rebase](https://github.com/Automattic/jetpack/blob/trunk/docs/git-workflow.md#keeping-your-branch-up-to-date) and otherwise make sure it's up to date and has clear testing instructions. You may also want to ping possible reviewers in case they've forgotten about it. Please close this PR if you think it's not valid anymore — if you do, please add a brief explanation.

If the PR is not updated (or at least commented on) in another month, it will be automatically closed.