test for pinning filters. moztrap 5931
move import to module-level
make pinning filter tests destructive
use helper method to do all checks on pinned filter color
do not return run in create_and_run method
Revert "do not return run in create_and_run method"

This reverts commit 60b0259d8cbc0134689b21e9c0f1c843a6169ca4.
add check for run name in test
simplify login for returning user