Add sysprop for identifying strict-run bugreports

This change adds 'dumpstate.strict_run', which sets stricter timeouts on
flaky sections. The default value for this property is 'true'.

Test: Build, wipe, and flash, then verify that:
      1) the strict-run log is emitted when taking a bug report
      2) manually running 'setprop dumpstate.strict_run false' results in
	 the strict-run log not being emitted in the next bug report
Bug: 283326935
Change-Id: Ic40b235f710b2858ec8ca463a8f6a796d9e6c98e