[Media] Secondary action buttons can be disabled.

Please refer to the screenshot at screen/43sXaFG3VAz27MH

Bug: 397989775
Test: tested in testbed app with fake data, see b/397989775#comment2 for
a screen recording of the entire thing in action in the compose gallery
app
Flag: EXEMPT none yet, code is currently unused

Change-Id: I06e6bb0a9c7fe2ed1f1ef624517a06f1ac64c35d