[Android] Check for IsDisposed() before accessing renderer View

[samhouts]

Description of Change

Containers on Android that inflate renderers as Views currently only check to see if the renderer is null. With the new Fast Renderers, it is possible for the Views themselves to be collected before the renderer is set to null. This change will ensure that the View is not disposed, and if it is, go ahead and rebuild the View from the renderer to prevent an ObjectDisposedException.

Observed on ScrollView, so there is a test case to prove the fix. Added the checks on several other suspicious container elements for good measure.

Bugs Fixed

Not targeted at a specific ticket, but it is possible that one or more of the recent ObjectDisposed tickets on 2.3.5 are resolved by this.

API Changes

None

Behavioral Changes

None

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Consolidate commits as makes sense