L2 cache bypass

[westin-m]

Addresses Bug 3542293: RequestRefresh not bypassing L2 Cache

Introduce a new interface that provides context to the event handler implementation, allowing it to optionally bypass a cache lookup.

This will need to be merged and released before the corresponding MISE fix can be merged.

[Copilot]

Pull request overview

This PR adds a context-aware configuration event handler API so ConfigurationManager can signal when a retrieval was triggered by RequestRefresh, enabling handlers to bypass a cache lookup (per Bug 3542293).

Changes:

• Introduces ConfigurationRetrievalContext and IConfigurationEventHandlerContextAware<T> to pass retrieval context (including BypassCache) into event handlers.
• Updates ConfigurationManager (blocking + non-blocking paths) to pass context into BeforeRetrieveAsync, preferring the context-aware overload when implemented.
• Adds OpenIdConnect test coverage and a context-aware mock event handler validating BypassCache behavior across first retrieval, automatic refresh, and RequestRefresh.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests/MockConfigurationEventHandlerContextAware.cs	Adds a context-aware test double implementing the new handler interface.
test/Microsoft.IdentityModel.Protocols.OpenIdConnect.Tests/ConfigurationManagerEventHandlerContextAwareTests.cs	Adds tests validating context-aware handler selection and BypassCache semantics.
src/Microsoft.IdentityModel.Protocols/PublicAPI.Unshipped.txt	Records newly introduced public surface area for API validation.
src/Microsoft.IdentityModel.Protocols/GlobalSuppressions.cs	Updates suppression target signature for the updated HandleBeforeRetrieveAsync method.
src/Microsoft.IdentityModel.Protocols/Configuration/IConfigurationEventHandlerContextAware.cs	Defines the new context-aware configuration event handler interface.
src/Microsoft.IdentityModel.Protocols/Configuration/ConfigurationRetrievalContext.cs	Defines the context object carrying the BypassCache signal.
src/Microsoft.IdentityModel.Protocols/Configuration/ConfigurationManager_Blocking.cs	Passes BypassCache to the handler in blocking mode based on refresh request state.
src/Microsoft.IdentityModel.Protocols/Configuration/ConfigurationManager.cs	Wires context into handler calls and attempts to propagate bypass behavior into background refresh flows.

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.