`cmd deviceidle tempwhitelist -r` should clear FGS tempallowlist too

Also clean up FgsTempAllowList, since the key is always UID.

Bug: 188789296
Test: atest FgsTempAllowListTest
Test: Manual test with `cmd deviceidle tempwhitelist` with and without `-r`,
	while monitoring the AMS dumpsys with the following command.
	$ watch -n 1 "adb shell dumpsys activity processes | sed -n '/mFgsStartTempAllowList/,\$p'"
Change-Id: I0e113b1614653c85e57a37579921c3baa7dedc78