[Trivial] Add method to retrieve mContentApps

[lazarkov]

Type

Comment fix, Other

Explanation

Add method to retrieve mContentApps, that will be used for testing later on.
The method is noted in the PR #33981
Line 154 of tv-common/AppTv.h class.

Platform

android, other

Platform Version(s)

No response

Testing

Manually tested with SDK

(Optional) If manually tested please explain why this is only manually tested

No response

Anything else?

No response

[github-actions]

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