Move to using managed identity for auth to CosmosDB.

[marrobi]

Resolves #345

What is being addressed

Waiting on Logging PR #3762

• Move to managed identity when connecting to the database when available.
• Use same connect method for health checks.
• Only attempt to create collection on bootstrap
• Split out control plane and data plane operations as have different permissions model.
• Create singleton database class to enable reuse of the cosmos client.
• Update Change Log

[github-actions]

Unit Test Results

588 tests   588 ✅  7s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit c33d9db.

♻️ This comment has been updated with latest results.

[DragosDanielBoia]

@microsoft-github-policy-service rerun

[marrobi]

/test-extended

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/test-destroy-env

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/test-extended

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/test-extended

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/test-extended

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