tools: remove test-asan/ubsan workflows

They have been disabled for months without anyone looking into fixing
the builds.

PR-URL: #56823
Reviewed-By: Yagiz Nizipli <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: targos