Change default branch to main

Adding an issue to track the TODO from !84 (merged).

merge the MR
push the main branch as a duplicate
make sure Intel ci is using the main branch
- Mesa_CI/mesa_jenkins!1694 (merged)
lock the old master branch (so the last commit will be the NOTE! commit in this MR)
set the default branch to main
edit the open MR's to target main
- https://gitlab.com/jljusten/src-fdo/-/blob/master/gitlab-retarget-mr.py

Edited Mar 29, 2021 by Jordan Justen

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