Merge branch 'extend-grahql-update-mutation-for-cluster-id' into 'master'

Support Cluster Agent ID in Environment Update mutation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121115



Merged-by: Jarka Košanová <jarka@gitlab.com>
Approved-by: Jarka Košanová <jarka@gitlab.com>
Reviewed-by: Shinya Maeda <shinya@gitlab.com>
Reviewed-by: Pam Artiaga <partiaga@gitlab.com>
Co-authored-by: Shinya Maeda <shinya@gitlab.com>