JS Components: Convert JetpackFooter component to TypeScript

[manzoorwanijk]

Changes proposed in this Pull Request:

• This PR converts JetpackFooter component to TypeScript.
• It also converts the JetpackFooter stories and unit tests to TS
• Adds more test cases for JetpackFooter unit tests

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?

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

No

Testing instructions:

• Checkout the PR
• Run cd projects/js-packages/storybook && pnpm run storybook:dev
• Confirm that all the stories of JetpackFooter component work as expected
• Check the consumers of JetpackFooter and related components and confirm that they work as expected
• Check for any regression

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • 0-as-1202276314264001

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation 🤖

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The e2e test report can be found here. Please note that it can take a few minutes after the e2e tests checks are complete for the report to be available.

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Once your PR is ready for review, check one last time that all required checks (other than "Required review") appearing at the bottom of this PR are passing or skipped.
Then, add the "[Status] Needs Team review" label and ask someone from your team review the code.
Once you’ve done so, switch to the "[Status] Needs Review" label; someone from Jetpack Crew will then review this PR and merge it to be included in the next Jetpack release.

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello manzoorwanijk! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D84905-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
This revision will be updated with each commit to this PR

[dhasilva]

It seems the controls are not there anymore:
https://automattic.github.io/jetpack-storybook/?path=/story/js-packages-components-jetpack-footer--default

Before	After

[manzoorwanijk]

It seems the controls are not there anymore: https://automattic.github.io/jetpack-storybook/?path=/story/js-packages-components-jetpack-footer--default

@dhasilva Thank you for catching that. It looks like an issue with Storybook that default props don't seem to work with ES6 default values - storybookjs/storybook#9626

I have added explicit default values.

[dhasilva]

🚀

[github-actions]

Great news! One last step: head over to your WordPress.com diff, D84905-code, and deploy it.
Once you've done so, come back to this PR and add a comment with your SVN changeset ID (e.g. r12345-wpcom).

Thank you!

[manzoorwanijk]

r249899-wpcom