Create Dead Man Snitches for observability platform

Details

• Point of contact for this request: @vespian_gl

SRE Support Needed Could you please create two DMS snitches for me, and put them into https://ops.gitlab.net/gitlab-com/runbooks/-/settings/ci_cd?

Their configuration:

{ name: 'observability', apiKey: '***', cluster: 'opstrace-staging' },                                                                                         
{ name: 'observability', apiKey: '***', cluster: 'opstrace-prod' },  

The PR for runbooks repo that adjusts runbooks/alertmanager/dummy-secrets.jsonnet will follow as soon as this Issue is addressed.