Prevent waitForBroadcast timeouts.

It looks like ag/19084766 wasn't sufficient, so we have
to revert to limiting the length of that operation.

Also technically that operation is only needed when
the receiver is called without the permission in the test,
so ensured that this only happens there and not elsewhere.

Bug: 270434248
Test: atest CtsSafetyCenterTestCases
Relnote: N/A
Change-Id: I43404b7f0bb45b73730e41406ea2837a45ce8be8