[Android] Remove listeners on dispose

[kvpt]

Description of Change

When disposing renderers the framework need to unsubscribe events,
because of the different lifetime between the two parts this often cause memory leaks and dispose issues.
For the DotNet part the form is an event with +=/-=, in several past PR I fixed some missing calls of this form.
But for Android part the form is different, it's SetListener or AddListener, and RemoveListener.
I have checked Android renderers code and found that some renderers lack the removal of the setted listeners.
The goal of this PR is to add the missing ones.

Issues Resolved

• fixes #

API Changes

None

Platforms Affected

• Android

Behavioral/Visual Changes

None

Before/After Screenshots

Not applicable

Testing Procedure

As always with dispose and memory leaks issues, not possible to directly test it, just check if current tests not regress.

PR Checklist

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

[rmarinho]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).