add custom headers for MSI authorizer

[ziyeqf]

Community Note

• Please vote on this PR by adding a 👍 reaction to the original PR to help the community and maintainers prioritize for review
• Please do not leave comments along the lines of "+1", "me too" or "any updates", they generate extra noise for PR followers and do not help prioritize for review

Description

In specific scenarios (Azure Container App or Service Fabric), the requests need additional headers. Reference: https://github.com/AzureAD/microsoft-authentication-library-for-go/blob/22fd2ee68abf6e6e926fa09387c078db25dad7e0/apps/managedidentity/managedidentity.go#L292-L296

This is a (please select all that apply):

• Bug Fix
• New Feature
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

a related issue on terraform repo: hashicorp/terraform#37268

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Note

If this PR changes meaningfully during the course of review please update the title and description as required.