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fix(@angular/build): ensure karma polyfills reporter factory returns a value

The factory function for the `reporter:angular--polyfills` Karma plugin did not return a value, which violates Karma's plugin contract. This could cause Karma to crash when multiple reporters were in use, particularly with tools that use Karma's multi-reporter functionality. This change modifies the factory to return an object with an empty `adapters` array (`{ adapters: [] }`). This satisfies Karma's plugin requirements and ensures compatibility with the multi-reporter, preventing the crash. Fixes #31039

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packages/angular/build/src/builders/karma
- application_builder.ts

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`‎packages/angular/build/src/builders/karma/application_builder.ts`

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Original file line number	Diff line number	Diff line change
`@@ -187,6 +187,9 @@ class AngularPolyfillsPlugin {`
`187`	`187`	`included: true,`
`188`	`188`	`watched: false,`
`189`	`189`	`});`
	`190`	`+`
	`191`	+ // Karma needs a return value for a factory and Karma's multi-reporter expects an `adapters` array
	`192`	`+ return { adapters: [] };`
`190`	`193`	`}, AngularPolyfillsPlugin),`
`191`	`194`	`],`
`192`	`195`	`};`

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Commit 4b49a20

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`‎packages/angular/build/src/builders/karma/application_builder.ts`

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