script and function for cleaning roots

[scytacki]

The Firebase function runs at midnight (UTC) and cleans out QA roots that are older than 24 hours. So that means it will run at 8pm/7pm ET time. And will delete any roots that were used before 8pm/7pm ET the previous day. The reason to wait 24 hours before deleting a root is that there might be some benefit to debugging a root that was created during a test run. The schedule above will give the developer between 24 and 48 hours to debug a root before it gets deleted. The amount of time depends on when the root was used. A root used at 8:01pm will not get deleted until 2 days later at 8pm.

The script can be used to manually clear out roots on a whatever schedule seems best. Also there is a default timeout on Firebase functions of 60s. So if too many roots have built up the function might timeout. The script will have no timeout so can be used to fix that situation if it happens.

This also refactors out the initialization code from the 2 tests.
It took a while to figure out the right configuration so Jest would not pick up two versions of firebase-admin dependency since it also exists in the parent node_modules.

The Jest tests of the functions now have to run serially because they share the same Firebase emulator resources.

Future work:

• also delete old dev roots. I think they should be deleted after a few months of inactivity.
• clean out all of the dev and qa roots that don't have the lastLaunchedTime field.

[cypress]

collaborative-learning    Run #13698

Run Properties:   Passed #13698  •  6c92170fa0: address PR comments

Project	collaborative-learning
Branch Review	188211348-fb-function-clean-roots
Run status	Passed #13698
Run duration	01m 45s
Commit	6c92170fa0: address PR comments
Committer	Scott Cytacki
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---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	1
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.64%. Comparing base (813b3d8) to head (6c92170).
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- Coverage   85.98%   54.64%   -31.34%     
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  Lines       37855    37704      -151     
  Branches     9635     9612       -23     
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- Misses       5004    16072    +11068     
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[bgoldowsky]

This looks good other than a couple of comments.

I didn't test it but the logic seems straightforward (the test configuration and dependencies linking, not so straightforward!)