dont run linting or fsc when on covid branch
dont run linting or fsc when on covid branch

fixes: CCI-287
flag = none

Test-Plan:
pushing to covid branch first (will link in message),
then will push to master.

on covid, the linting and fsc should not run.
on master, they should.

covid test: https://jenkins.inst-ci.net/job/Canvas/job/main-canvas/24230/

Change-Id: Icc559df8453d4ab4f7267cdbd47329816e827ac9
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/230385
Reviewed-by: Derek Bender <d24d8a7ee520e34b1cec38800225d9f36b552df7@instructure.com>
Reviewed-by: Jacob Powell <03c892efa7d90f6161831192fc2bb1ab9ff2d4d9@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Rex Fleischer <360d56e185853f069087eaa5288d1374fc56d750@instructure.com>
Product-Review: Rex Fleischer <360d56e185853f069087eaa5288d1374fc56d750@instructure.com>

instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms