Feat: Add Go Snyk CLI Scanner jobs

Introduce Go Snyk CLI scanner jobs. These jobs can be triggered to
download the latest version of Snyk's CLI scanner and trigger a scan
for Go based repos. These jobs produce a report which is published
into Snyk's dashboard. These reports are fetched and reflected back
into the LFX Security tool.

Issue: RELENG-4609
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: Id1f80d255896b44977979322fae663da13c95287