wpcomsh: COLOURlovers: Remove Temporary Patterns Tracking

[mreishus]

Proposed changes:

• Removes temporary tracking of COLOURlovers pattern usage added 3 months ago.
• See: PR 1819 on the old wpcomsh repo + pdKhl6-3qP-p2#comment-7087

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

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

Testing instructions:

• Verify no references to wpcomsh_temporarily_maybe_track_colourlovers_pattern_usage remain
• Basic tests

[github-actions]

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[mreishus]

• rebased