Include WMShell protolog in bug-report

When generating the bug-report, dumpstate will now issue a
"save-for-bugreport" command to the WMShell and WMShell flashes the
proto logging file to /data/misc/wmtrace if it's enabled.

/data/misc/wmtrace is included in the final bug-report.

Bug: 251513116
Test: adb bugreport
Ignore-AOSP-First: cherry-pick of aosp/2413712
Merged-In: I2f48511868a871a290ca38126c4a4c3016169db4
Change-Id: I2f48511868a871a290ca38126c4a4c3016169db4