Fixes frequent ANR taking bugreport in background

Remove the task of DumpAppInfos from the parallel running queue
to avoid RunDumpsysNormal and DumpAppInfos running at the same time.
The system_server may be overwhelmed and cause applications anr issues.

Bug: 175747281
Test: atest dumpstate_test
Test: adb bugreport
Change-Id: I2d7fae837938caf271e2e87aade018d1ee8d3175