fix: write-data sections and code samples

[jstirnaman]

Closes #5475 for v3 python write_options

• Updates /write-data/ sections
  • makes cloud-serverless consistent with dedicated and clustered
  • Updates dedicated and clustered nomenclature (measurements -> tables, buckets -> databases)
• Fixes get-started code blocks, formats curl response for tests
• Improves test runners
  • You'll need to move your docs-v2/.env.<product> test credentials config to docs-v2/content/influxdb/<product>/.env.test
  • Refactors test content into a separate container and volume for future test runners (e.g. JavaScript) to use
  • Doesn't fail if no tests (code blocks) exist in the staged files.

Describe your proposed changes here.

• [ ] Signed the InfluxData CLA (if necessary)
• [ ] Rebased/mergeable