cli: Include jetpack_vendor dirs in jetpack clean vendor

[anomiex]

Proposed changes:

When selecting the "vendor" option for jetpack clean, "jetpack_vendor" dirs should also be removed.

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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Jetpack product discussion

None

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

No

Testing instructions:

• Try it out in various combinations.

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