Toggle filestore api as part of nightly cleanup

[nick-stroud]

Prior to this change we will have to manually toggle the filestore api every 49 times we run integration tests ref.

If filestore is in use when job runs then api will not be disabled and cleanup job will succeed.

Tested:

• Manually ran on cloud build.
• Created a filestore, then ran cleanup job, then verified filestore was still present. (aka: will not force delete)

Submission Checklist

• Have you installed and run this change against pre-commit? pre-commit install
• Are all tests passing? make tests
• If applicable, have you written additional unit tests to cover this
  change?
• Is unit test coverage still above 80%?
• Have you updated any application documentation such as READMEs and user
  guides?
• Have you followed the guidelines in our Contributing document?

[cboneti]

I am a little afraid of randomly waiting for a minute (unless they have an SLO around that), but I doubt we should invest much more time on this, so maybe just reorder the build steps a little so re-enabling is done last?