Grant abandon permission for mdb/jetstream-releng

So https://chromium-review.googlesource.com/c/chromiumos/chromite/+/6323786 can be restored by wifi members

Bug: 403286626
Change-Id: I1be05589a4ef58904228bbbe61ccb41213a456e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/+/6535052
Reviewed-by: Mike Frysinger <vapier@chromium.org>