Add support for repeatable feature tours.

[techanvil]

Summary

Addresses issue:

• Add support for repeatable feature tours. #11811

Relevant technical choices

PR Author Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 5.2 and PHP 7.4.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

• Run the code.
• Ensure the acceptance criteria are satisfied.
• Reassess the implementation with the IB.
• Ensure no unrelated changes are included.
• Ensure CI checks pass.
• Check Storybook where applicable.
• Ensure there is a QA Brief.
• Ensure there are no unexpected significant changes to file sizes.

Merge Reviewer Checklist

• Ensure the PR has the correct target branch.
• Double-check that the PR is okay to be merged.
• Ensure the corresponding issue has a ZenHub release assigned.
• Add a changelog message to the issue.

[github-actions]

Storybook is ready:

• View Storybook

[github-actions]

Size Change: +880 B (+0.04%)

Total Size: 2.23 MB

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[github-actions]

Build files for b6d7b49 have been deleted.

[techanvil]

While implementing this issue, I realised it would be more consistent to provide isRepeatable as a prop, rather than retrieving the current tour via getCurrentTour() as specified in the IB.

[nfmohit]

LGTM ✅