What this PR does / why we need it

reworks our renovate self hosted action:

• now does a dry run on every PR that is running with a change on the renovate config
• uses proper tokens based on if running with dry run or not
• fixes up our GO env variables to have proper settings (was missing a *)
• gets rid of both top level renovate config and repo level config and replaces it with a config located in .github/renovate.json5 (this is an official default path of renovate and will always be recognized)
• 'minimumReleaseAge': '14 days' is now set to make blast radius smaller on buggy releases
• autoMerge has been enabled for patch releases to automate dependencies. Currently in PR form. If this works well enough over time we might want to do branch based updates which will remove noise completely

Which issue(s) this PR fixes

Allows us to preview renovate changes on PRs and speeds up renovate runs significantly