Renaud Hartert

[Internal] Add DCO guidelines

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## Changes This PR updates the contributing guidelines to include the DCO (Developer Certificate of Origin) that external contributors must sign-off to contribute. ## Tests N/A

Use Databricks OIDC endpoints for Azure OIDC flows.

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## What changes are proposed in this pull request? This PR uses the Databricks endpoints for all OIDC flows rather than branching on Azure vs Databricks flow. This is not...

Stop using config.Environment

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## Changes ## Tests - [ ] `make test` run locally - [ ] relevant change in `docs/` folder - [ ] covered with integration tests in `internal/acceptance` - [...