fix(@angular/build): ensure @angular/compiler is loaded for Vitest TestBed initialization - #34202
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This pull request adds an initialization step for the Angular compiler (@angular/compiler) in the Vitest unit test runner by registering a new virtual file and entry point (init-compiler.js) that imports @angular/compiler and prepends it to the Vitest setup files. Additionally, a new integration test has been added to verify that providers injecting services requiring JIT compilation function correctly. No review comments were provided, so there is no feedback to address.
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…stBed initialization Provide a dedicated setup file to import '@angular/compiler' prior to TestBed initialization. This ensures the compiler facade is published before 'init-testbed.js' or any shared code-split chunks (such as those configured via 'providersFile') are evaluated, avoiding JIT compilation errors when injectable dependencies are resolved during test initialization.
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Provide a dedicated setup file to import '@angular/compiler' prior to TestBed initialization. This ensures the compiler facade is published before 'init-testbed.js' or any shared code-split chunks (such as those configured via 'providersFile') are evaluated, avoiding JIT compilation errors when injectable dependencies are resolved during test initialization.
Closes #31993