[UI Tests] - Remove classic editor tests

[jostnes]

Part of: #17281

What

This PR removes classic editor tests (e2ePublishSimplePostClassic and e2ePublishFullPostClassic) from the test suite

Why

Users are no longer able to create classic editor posts from the mobile app, so this is no longer a critical flow. There are also no recent (from this year) issues/PRs that are classic editor related confirming that this is a low-priority feature

Testing

All other tests in the test suite should still work as expected.

[wpmobilebot]

📲 You can test these changes on WordPress by downloading wordpress-installable-build-pr17296-d7077dd.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	WordPress
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	d7077dd

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[wpmobilebot]

📲 You can test these changes on Jetpack by downloading jetpack-installable-build-pr17296-d7077dd.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	Jetpack
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	d7077dd

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[pachlava]

Thanks for doing this @jostnes!

[pachlava]

I think this can be merged @jostnes? 👋

[jostnes]

I think this can be merged @jostnes? 👋

I was waiting for confirmation from the Mobile Gutenberg team on this one, got it yesterday so I'll merge this now 🚀