test(frontend): add ConflictingFileModalContentComponent unit tests

[Roshan3580]

Purpose of the PR

Closes #5465

This PR adds frontend unit tests for ConflictingFileModalContentComponent to improve test coverage and verify correct handling of injected modal data.

Summary of Changes

• Added conflicting-file-modal-content.component.spec.ts
• Added a test to verify the component is created successfully
• Added a test to verify the component correctly exposes the injected NZ_MODAL_DATA payload

Design Proposal

N/A — this PR only adds unit tests for existing functionality and does not introduce behavioral changes.

Technical Design Diagram/Description

The tests validate that the component initializes correctly and that modal data provided through Angular dependency injection is exposed as expected by the component.

GIFs/Screenshots

N/A — test-only change.

Testing

Executed locally:

yarn test --include='**/conflicting-file-modal-content.component.spec.ts'
yarn lint

Both commands completed successfully.

[github-actions]

👋 Thanks for your first contribution to Texera, @Roshan3580!

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[Yicong-Huang]

@Roshan3580 please use our PR template. Please feel free to reopen once it is ready. Thanks!

[Roshan3580]

@Yicong-Huang I've updated the PR description to follow the Texera PR template. I don't appear to have permission to reopen the PR from my side. Could a maintainer please reopen it for review? Thank you.

[Ma77Ball]

@Roshan3580, can you please make sure the template matches this layout:

### What changes were proposed in this PR?
…

### Any related issues, documentation, discussions?
Closes: #…

### How was this PR tested?
…

### Was this PR authored or co-authored using generative AI tooling?
…

[Yicong-Huang]

Hi @Roshan3580, the PR description is still not following our template. I'd be happy to reopen it once you update that. thanks.