[NEXUS-6241] Add Support Request tab to support tools
Refine support request description, add icon.
Refine text based on input from Rich
More text refinement
Only add the supportrequest tab if not running in OSS (ie. pro or trial)
[NEXUS-6241] update url
Merge pull request #522 from sonatype/NEXUS-6241-support-request-28x

REVIEW: [NEXUS-6241] Add Support Request tab to support tools