Increase the keep alive time for internal executor thread

This change ensures that the keep alive time for the executor thread is
changed to 24 hours. The thread, once created, will wait for 24 hours
for any new task to be assigned to it before terminating. This helps us
save on the resource wastage on creating a new thread each time a quiet
mode operation takes place, while also destroying the thread in
scenarios like when no profile is added.

Test: Tested locally on device by adding logs and capturing pergetto
traces
Bug: 303201022

Change-Id: I642e5d95f4c4884673486fafc6e11381e2467a20