Update Renovate configuration to best practices

[thompson-tomo]

Which problem is this PR solving?

This upgrades the renovate preset to follow the best practices rather than just the recommended as outlined in https://docs.renovatebot.com/upgrade-best-practices/

The difference is the addition of the following profiles/rule-sets:

• docker:pinDigests
• helpers:pinGitHubActionDigests which has an override to preserve readability
• :configMigration
• :pinDevDependencies
• abandonments:recommended

In effect this gives us insight packages which have been abandoned, allows for automatic migration of legacy config options and also rules for dev dependencies.

This also aligns the settings with what the spec repo uses https://github.com/open-telemetry/opentelemetry-specification/blob/main/.github/renovate.json.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.21%. Comparing base (4997d32) to head (fb61746).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6140   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files         316      316           
  Lines        9389     9389           
  Branches     2167     2167           
=======================================
  Hits         8940     8940           
  Misses        449      449           

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