Switch default OTel sampler to TraceIdRatioBased

[GFriedrich]

What this PR does / why we need it:

• switches the default OTel sampler from AlwaysOn to TraceIdRatioBased, which is a more sane default in regards to load
  • solves #12443
• fixes various documentation inconsitencies
  • solves #12443 and #12432

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] CVE Report (Scanner found CVE and adding report)
• [x] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation

Which issue/s this PR fixes

fixes #12443 fixes #12432

How Has This Been Tested?

Checked that the default generated config files contains the expected configuration.

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [ ] I have added unit and/or e2e tests to cover my changes.
• [x] All new and existing tests passed.