Test: Reactive spies preserve the this instance

[kasperpeulen]

Closes #28419

What I did

Test: Reactive spies preserve the this instance

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  • bug: Internal changes that fixes incorrect behavior.
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[greptile-apps]

PR Summary

• Added test cases in code/lib/test/src/spy.test.ts to verify this context preservation in reactive spies.
• Modified code/lib/test/src/spy.ts to use apply instead of bind for maintaining this context in listenWhenCalled function.

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