[WIP]: Add Sponsored Post feature to WordAds

[cphilleo]

Proposed changes:

• Adds Sponsored Post feature to WordAds

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Testing instructions:

• Go to '..'

[github-actions]

Are you an Automattician? You can now test your Pull Request on WordPress.com. On your sandbox, run

bin/jetpack-downloader test jetpack add/wordads-sponsored

to get started. More details: p9dueE-5Nn-p2

[github-actions]

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[jeherve]

Noting that this was done to ensure compatibility with AMP: #12733. Reverting that change may break compat' with the AMP plugin.

[cphilleo]

Thanks, @jeherve! I recall we changed this for a reason, but I had trouble remembering the circumstances. I'll split the initialization into phases.

[github-actions]

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

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

No further action is needed. But it's worth checking if this PR has clear testing instructions, is it up to date with trunk, and it is still valid. Feel free to close this PR if you think it's not valid anymore — if you do, please add a brief explanation.

[github-actions]

This PR has been automatically closed as it has not been updated in some time. If you want to resume work on the PR, feel free to restore the branch and reopen the PR.