CHANGE: Add action map disable / enable to rebinding sample

[Secticide]

Description

When investigating ISXB-1396 and ultimately closing as by design; a possible improvement to our rebinding UI sample surfaced.

This PR changes the rebinding UI sample. When rebinding an action, the parent action map and the UI action map (in the project wide actions) are disabled. Considering the sample is intended to be used with older versions of Unity where project wide actions were not yet introduced, the input action asset has been manually added to the RebindActionUI script (and editor).

Testing status & QA

Tested this locally with Unity 2021.3.45f1 and 6. Also tested with keyboard & mouse and a Dualshock 4 controller (when wired). But all we're doing is disabling the action map so this would have been tested widely by other tests.

Overall Product Risks

• Complexity: 0
• Halo Effect: 0

Comments to reviewers

Let me know if the team would like the reference to the UI action map to be obtained a different way, currently this is collected from the assigned default action map when the component is enabled via a call to InputActionAsset.FindActionMap.

Checklist

Before review:

• Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

After merge:

• Create forward/backward port if needed. If you are blocked from creating a forward port now please add a task to ISX-1444.

[ritamerkl]

Thanks Jak!

[jfreire-unity]

Looks good! Thanks for adding this!
Added Paulius to do a sanity QA check

[Secticide]

Rebased to ensure we're up to date with develop. Fingers crossed the tests run successfully this time.

I doubled checked the previously failing test and it definitely wasn't related to these changes.