LU-17358 lprocfs: make job_stats job_id valid yaml

LU-17358 lprocfs: make job_stats job_id valid yaml

Fix quoting job_id to account for leading '@' being reserved.

Test-Parameters: trivial
Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>
Change-Id: Ifce3edc9b636db2f059ab9960488972a152d2e7a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53424
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Feng Lei <flei@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>