Use hot folder with values files for baselines; render all resources

[levan-m]

What this PR does / why we need it:

• Dropping individual baseline tests in favor of hot folder where adding new baseline is matter of adding values file with a sensible name.
• Alway render full chart since we shouldn't have any issues with dynamic fields and we can compare as strings or maps.

Change can be verified by looking at the diff between old and new baselines. New baseline should contain resource in old baseline, plus additional resources.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Chart Version bumped
• Documentation has been updated with helm-docs (run: .github/helm-docs.sh)
• CHANGELOG.md has been updated
• Variables are documented in the README.md
• For Datadog Operator chart or value changes update the test baselines (run: make update-test-baselines)

[hestonhoffman]

Tiny edit