Makeshift analog of Strictmode leak detector

Strictmode leak detector is still a goal, but we might not be able to
achieve it in R. Strictmode has several framework-side bugs that perhaps
hide Launcher-side strictmode violations, while the time to fix
everything is limited, and new leaks get introduced all the time.

For now, implementing a check that is slightly more relaxed than
Strictmode, but still ensures the absence of leaks. I’ll keep
eliminating Strictmode violations as well as keep strengthening the
makeshift checker conditions until we’ll be able to enable Strictmode in
continuous testing.

I’m disabling Strictmode checks for now so that they don’t generate
unnecessary hprof dumps, but leaving the code dealing with strictmode.

Bug: 139137636
Change-Id: Ib10136b0d4e9892f70a19cd052ae5a54cf0a4efb