Add new support tag when using app passwords for jetpack sites

[itsmeichigo]

Closes WOOMOB-1186

Description

This PR adds a new tag jetpack_site_using_app_passwords for support tickets when users has application password switching for their Jetpack site.

Testing steps

1. Log in to a Jetpack site with WPCom credentials. Ensure that the site has app passwords enabled.
2. After logging in, confirm that requests are made directly with app password.
3. Go to Menu > Settings > Help & support > Contact support > send a test ticket with message like "Testing, please close ticket".
4. Check on Zendesk for your ticket and confirm that jetpack_site_using_app_passwords is listed as one of the tags.
5. In the app, turn off app password in Menu > Settings > Experimental Features. Confirm that requests are made with Jetpack proxy.
6. Repeat step 3 and confirm that the new ticket doesn't have tag jetpack_site_using_app_passwords.

Testing information

Tested and confirmed the above cases with simulator iPhone 16 iOS 18.2

Screenshots

N/A

---

• 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 from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16123-919437e
	Version	23.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	919437e
	Installation URL	4bdkiger3pg30

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.