chore(ci): remove deprecated fabfile test option

[Neudrino]

and this for over a year now

I did a full text search for fab test as well as fab .* test and could not find any active usages with that.

[github-actions]

Thanks for opening a PR! 💯

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[github-actions]

feg-workflow

    2 files  203 suites   40s ⏱️
374 tests 374 ✔️ 0 💤 0 ❌
388 runs  388 ✔️ 0 💤 0 ❌

Results for commit 6e5bbbf.

♻️ This comment has been updated with latest results.

[github-actions]

dp-workflow

14 tests   14 ✔️  2m 14s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit 6e5bbbf.

♻️ This comment has been updated with latest results.

[maxhbr]

LGTM

[github-actions]

agw-workflow

473 tests   468 ✔️  2m 36s ⏱️
    1 suites      4 💤
    1 files        1 ❌

For more details on these failures, see this check.

Results for commit d332dd4.

[voisey]

I think the comment at the top of the file, specifically lines 36 and 37, should be modified to reflect the switch from test to release.