adds chatops commands workflow

Why is this change being made?

Support Engineering is working toward a blended team model. Support Engineers who don't have a GitLab.com admin account can't efficiently service such support requests. &306 compiles a number of ChatOps commands that either have been or are planned to be implemented to remove the access barrier.

This MR adds a workflow referencing available ChatOps commands for Support Engineers.

How will this merge request impact page speed?

N/A

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what