Show Zendesk to paying users

[guarani]

Fixes #20154

This PR updates the WP app to show Zendesk support to paying users (i.e. those with at least one site that has a paid plan) and show forum support to free users. No changes were made to the JP app.

⚠️ This PR relies on the following bug fix: wordpress-mobile/WordPressKit-iOS#578

To test

Verify the following behavior:

	Feature Flag	Plan	Support
WP App	On	Free	Forum
WP App	On	Paid	Zendesk
WP App	Off	Any	Zendesk
JP App	Any	Any	Zendesk

Note:

• The feature flag is under Me | App Settings | Debug | "Provide support through a forum"
• If Zendesk is not available (if the Zendesk SDK isn't ready for whatever reason) we show the forum, no matter which app it is or what plan the user is on.

Regression Notes

1. Potential unintended areas of impact

If this change isn't properly implemented, it could prevent users of the WP and JP apps from getting support.

5. What I did to test those areas of impact (or what existing automated tests I relied on)

I tested using the above table on an iPhone.

6. What automated tests I added (or what prevented me from doing so)

I updated existing tests to provide test coverage for this change.

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr20163-bd069be on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr20163-bd069be on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[twstokes]

This looks great to me @guarani, thanks for adding the tests! 🚀

I left just a couple nitty, optional comments. I also left a question on the WPKit PR.

All manual tests matched the table in the testing portion of the PR.

Thanks!

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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