Add reason to NoAnalysis

[chao2zhang]

Reimplement #2065.

I am trying to enable leak canary in tests in my repo's
CI pipeline but found that leak detector for all tests
are returned with NoAnalysis.

So I am adding logs in this commit to help us understand
where the exit point is, given that there are multiple
return statements and checking on the timestamp is not
always reliable.

[pyricau]

Thanks!

[pyricau]

If you want to try this out: https://square.github.io/leakcanary/faq/#how-do-i-use-the-snapshot-version