Adding a new slash command prow-job:list-qe-jobs

[JianLi-RH]

What this PR does / why we need it:

With this new slash command we can:

1. List all CI jobs for Openshift QE
2. We can show current status report and platform coverage report
3. Save us time to search jobs

We can run this slash command by both:

"List all prow jobs which name contains release-4.21 and upgrade"
Or
/prow-job:list-qe-jobs "release-4.21 upgrade"

Special notes for your reviewer:

Checklist:

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.

Here is a sample report:
prow_jobs_report.html

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JianLi-RH
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[enxebre]

prefix this with a convention that avoid clashing with other processes e.g. LIST_QE_JOBS_BEARER