add retry fields to azure backend config

[aahel]

Description

This pr adds support for the following missing fields in vault_azure_auth_backend_config. Api doc

• max_retries

• retry_delay

• max_retry_delay

Closes VAULT-39759

Checklist

• Added CHANGELOG entry (only for user-facing changes)
• Acceptance tests where run against all supported Vault Versions

Output from acceptance testing:

...

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PCI review checklist

• I have documented a clear reason for, and description of, the change I am making.

• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.

• If applicable, I've documented the impact of any changes to security controls.

  Examples of changes to security controls include using new access control methods, adding or removing logging pipelines, etc.

[benashz]

Looking good! I wonder if would be possible to replace the duration notation with seconds (int). I think that might make things a bit simpler.