add databricks m2m wiki

[eric-wang-1990]

Add instruction about Databricks Client Credentials, and remove the Username/Password option.

[learn-build-service-prod]

Learn Build status updates of commit f13bbae:

✅ Validation status: passed

File	Status	Preview URL	Details
powerquery-docs/connectors/databricks-azure.md	✅Succeeded
powerquery-docs/connectors/databricks.md	✅Succeeded
powerquery-docs/connectors/media/databricks/dbc-pat.png	✅Succeeded
powerquery-docs/connectors/media/databricksazure/azdbc-pat.png	✅Succeeded

For more details, please refer to the build report.

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[Court72]

@eric-wang-1990 - Thank you for your contribution. Would you take a moment to sign the Contributor License Agreement (CLA)? After the CLA is signed, someone can review your pull request. Thanks!

[Court72]

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[eric-wang-1990]

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@microsoft-github-policy-service agree [company="{Databricks}"]

[eric-wang-1990]

@microsoft-github-policy-service agree company="Databricks"

[prmerger-automator]

@eric-wang-1990 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[prmerger-automator]

@eric-wang-1990 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[Court72]

@DougKlopfenstein

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

[seesharprun]

#assign:dougklopfenstein

[prmerger-automator]

Users dougklopfenstein are already assigned.