Alloy Mixin: job label bugfixes

[gaantunes]

PR Description

This is fixing 2 bugs: job label queries is set to = instead of =~ by default. Two Cluster Overview dashboard queries are broken due to typo.

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• [ ] CHANGELOG.md updated
• [ ] Documentation added
• [ ] Tests updated
• [ ] Config converters updated