TimeStats: remove the regex checks on layer name

This change removes the regex validation on the layer name. Instead, now we just
check if the layer name meets the minimum length requirement set in TimeStats,
as well as filtering out the PopupWindow layer names.

This change also removes the regex extraction for the package name. It's not
making sense to do that in the platform. After we have the authenticated package
name from WindowManager, we can upload the package name info again.

Bug: 140266250
Test: atest libsurfaceflinger_unittest:TimeStatsTest
Change-Id: I476bb2a81c2a0d1e99663f4e0fe78cc3e6cf7f6b