WPCOMSH: Use WP_CLI to activate wordads module post-transfer

[cphilleo]

Proposed changes:

• Use WP_CLI to activate the wordads module if necessary during post-transfer

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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