Add auto-generated scenes by Unity play mode tests

[nowsprinting]

Reasons for making this change:

Unity Test Framework is official testing framework for Unity. Unity Test Framework has two testing mode, Edit mode and Play mode.

Play mode tests is run in the Scene. Unity Test Framework are auto-generate one scene file when run play mode tests. This scene file is delete when all tests finished, normally. But, scene file may not be deleted when test is abnormally terminated.

e.g.

-rw-r--r--    1 ko2hase  staff  14582  2  5 23:37 InitTestScene638112370725555120.unity
-rw-r--r--    1 ko2hase  staff    155  2  5 23:37 InitTestScene638112370725555120.unity.meta

Links to documentation supporting these rule changes:

No documents for auto-generated scene file.

[nowsprinting]

See this issue comment. (still not fixed) https://issuetracker.unity3d.com/issues/testrunner-playmode-test-leaves-behind-inittestscene-dot-dot-dot-scene-assets-after-test-runs

[github-actions[bot]]

This PR is stale because there have been no updates in 90 days. It will close after 180 days of inactivity. Leave a comment if you want to keep it open :smile:

[nowsprinting]

anyone?

[wirecat]

@nowsprinting There are merge conflicts at the moment. Could you please resolve them?

[nowsprinting]

@wirecat Thanks, I fixed it!