build: ignore report files generated during tests

[Flarna]

At least on windows I get files like report.20191212.212411.11544.0.001.json
in the root of my repo but I expect they shouldn't be committed.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

[BridgeAR]

I do remember getting those as well before on Linux. This seems like a bug in a test. It should clean up after itself, which it does not seem to do properly. I would rather fix the test though than ignoring these files.

[Flarna]

Ah ok, that sounds reasonable. Any hints which tests generate such files?

[BridgeAR]

It's from the newly added report module. It could therefore be any test that corresponds to that module. Seems like we have test/report and test/common/report.js. Especially the latter is probably used by the tests that might be interesting here.

[Flarna]

close as real fix is in #30925