add flag for CS aduio flicker

b/290847206 was merged to V without a flag to gate the new logic.
This CL gates all the changes in b/290847206 and updates 2 tests.

Fixes: 309540769
Bug: 290847206 (original bug)
Test: updated 2 unit tests
Change-Id: I05dfa70e06154f3f8a114455432e04b0e77b3a56
diff --git a/flags/telecom_calls_manager_flags.aconfig b/flags/telecom_calls_manager_flags.aconfig
new file mode 100644
index 0000000..7153f81
--- /dev/null
+++ b/flags/telecom_calls_manager_flags.aconfig
@@ -0,0 +1,8 @@
+package: "com.android.server.telecom.flags"
+
+flag {
+  name: "fix_audio_flicker_for_outgoing_calls"
+  namespace: "telecom"
+  description: "This fix ensures the MO calls won't switch from Active to Quite b/c setDialing was not called"
+  bug: "309540769"
+}