VideoPress block: Add tests to verify Privacy and Rating settings

[SiobhyB]

Part of the coverage efforts outlined in #5734

Description

• The changes in this PR iterate on the work done in VideoPress block: Initial setting tests #5751 to add test coverage for the Privacy and Rating settings.
• A new helper, pressSettingInPicker, has been introduced to loop through and select each of the available options in the Privacy and Rating pickers.

To test:

• Verify the HTML the changes to the snapshot file matches with the reality of what the block's HTML would look after making the relevant changes.
• Run the TEST_RN_PLATFORM=ios npm run test src/test/videopress/edit.js and TEST_RN_PLATFORM=android npm run test src/test/videopress/edit.js commands from the terminal to verify the tests pass as expected. Also, verify the tests on this PR pass.

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PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

Wanna run full suite of Android and iOS UI tests? Click here and 'Approve' CI job!

[fluiddot]

The first privacy option (Site default (Public)) can also be Site default (Private) if the site is private. I'm wondering if it would be worth adding a test case for this, WDYT? Note that it would require mocking the hook or the fetch request that returns the site privacy value.

[SiobhyB]

I think that's a great idea! I looked a bit into what was needed and see that it would involve mocking the useSyncMedia hook in order to get the privateEnabledForSite value, like here. I think that would be easier to get working when that hook has been mocked for testing the syncing, so will make a note to follow up with a different PR after that. :)

[SiobhyB]

Closing, as discussed in #5754 (comment). Edit: Wrong PR! 🤦‍♀️

[fluiddot]

Awesome work @SiobhyB 🏅 ! LGTM 🎊 !