Honor access token type in bearer auth policy

[rohitsinghal4u]

Updates BearerTokenAuthenticationPolicy to use AccessToken.getTokenType() when setting the Authorization header. This is a Core prerequisite for PoP/MSI token binding flows while preserving Bearer as the default.\n\nValidation:\n- mvn -pl sdk/core/azure-core -Dtest=BearerTokenAuthenticationPolicyTests test -DskipCheckStyle=true -DskipRevapi=true -Dgpg.skip=true -q

[Copilot]

⚠️ Not ready to approve

The new null/empty token-type fallback branch is not currently covered by tests, leaving the defaulting behavior unverified.

Pull request overview

Updates BearerTokenAuthenticationPolicy in azure-core to honor AccessToken.getTokenType() when forming the Authorization header, enabling non-Bearer schemes (e.g., Pop) while retaining Bearer as the default behavior.

Changes:

• Use AccessToken (including tokenType) when setting the Authorization header in both async and sync flows.
• Add new unit tests asserting that a non-default token type (e.g., Pop) is used in the Authorization header.

File summaries

File	Description
sdk/core/azure-core/src/main/java/com/azure/core/http/policy/BearerTokenAuthenticationPolicy.java	Switch header construction to incorporate AccessToken.getTokenType() with a fallback to Bearer.
sdk/core/azure-core/src/test/java/com/azure/core/http/policy/BearerTokenAuthenticationPolicyTests.java	Add async and sync tests validating that tokenType is reflected in the Authorization header.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 1

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