Stop setting isBroker in initialize

[tnorling]

Changes to the broker model make the isBroker flag unnecessary, removing.

[Copilot]

Pull Request Overview

This PR removes the isBroker parameter from the initialize method across the MSAL browser library as part of changes to the broker model that make this flag unnecessary.

• Removes the isBroker parameter from the initialize method signature in controllers and interfaces
• Simplifies the initialization logic by removing broker-specific conditional code
• Updates tests to reflect the simplified initialization interface

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/msal-browser/src/controllers/IController.ts	Updates interface to remove isBroker parameter from initialize method
lib/msal-browser/src/controllers/StandardController.ts	Removes isBroker parameter and conditional broker logic from initialize method
lib/msal-browser/src/controllers/NestedAppAuthController.ts	Removes unused isBroker parameter from initialize method
lib/msal-browser/src/app/PublicClientApplication.ts	Updates call to controller initialize to remove isBroker argument
lib/msal-browser/test/app/PublicClientApplication.spec.ts	Removes test that verified isBroker parameter passing
lib/msal-browser/apiReview/msal-browser.api.md	Updates API documentation to reflect removed parameter
change/@azure-msal-browser-08e8affc-ae18-41c2-821d-112c37fbdbdb.json	Beachball change file for tracking this patch-level change

[sameerag]

This is because it is no longer a PCA instance?