Default enable Android accessibility improvements

[jfversluis]

Description of Change

Enables the Android accessibility flag by default. First step for taking out all the code that this enables/disables and make that functionality the default behavior.

Additionally this does introduce a new flag to revert to the (now) old behavior so that people can opt-out for the time being.

Issues Resolved

• fixes Verify we can take out the accessibility feature flag and turn it on by default #15054

API Changes

None

Platforms Affected

• Android

Behavioral/Visual Changes

Shouldn't be none except for better accessibility features

Before/After Screenshots

Not applicable

Testing Procedure

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)

[TomSoPolaris]

Heads up, this change seems to have broken our ability to find accessibility IDs on our suite of Appium automated UI tests. We encountered this when we upgraded from XF 5.0 SR 10 to SR 11

[PureWeen]

@TomSoPolaris can you test with the nuget from this PR once it's readY?
#15436

If it's still not working can you create an issue and provide a sample of your appium tests that stopped working?

[SiNeumann]

breaks existing test as automation_id/content-desc is no longer present after refresh #15446

[Pastajello]

@jfversluis
should the flag to disable this be "Disable_Accessibility_Experimental" as code indicates or "AccessibilityExperimental" as instruction in release notes says?

[TomSoPolaris]

Looks like we'll try this again once XF 5.0 SR 12 is released #15446 (comment)

[askariya]

@TomSoPolaris Did you have any luck with newer Xamarin Forms versions? I'm still encountering the content-desc issue.

[TomSoPolaris]

@TomSoPolaris Did you have any luck with newer Xamarin Forms versions? I'm still encountering the content-desc issue.

We're using Xamarin.Forms 5.0.0.2545 (5.0.0 Service Release 13) now, but I think our QA devs just worked around the issue. I think they changed the android selectors to use Id instead of AccessibilityId.