refactor: clean up imports and remove unused code across multiple components

[Kanchan-Microsoft]

Purpose

This pull request primarily removes unused code, cleans up imports, and simplifies state handling across several frontend files. The changes aim to reduce technical debt and improve code readability without impacting core functionality.

Code cleanup and removal of unused logic:

• Removed the checkConnection function from main.jsx, which was previously used for backend connectivity checks but is no longer needed.
• Deleted the ProcessingStage and Agents enums from modernizationPage.tsx as they are not referenced elsewhere.
• Simplified the file fetch logic in modernizationPage.tsx by removing an unused variable.
• Removed the extraction of blocking info from the progress modal, as the value was not being used.

Import and state handling simplifications:

• Cleaned up unused imports in batchHistoryPanel.tsx, bottomBar.tsx, landingPage.tsx, modernizationPage.tsx, and processPage.tsx for more concise and maintainable files.
• Updated utility imports in batchView.tsx to only include those in use.
• Refactored state handling in landingPage.tsx by removing an unused upload state and updating the handler to a placeholder for potential future use.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

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Other Information

[Copilot]

Pull request overview

This PR focuses on frontend refactoring/cleanup by removing unused code paths and trimming imports to reduce technical debt and improve readability without changing intended behavior.

Changes:

• Removed unused enums and variables, and simplified some fetch/state-handling code paths.
• Cleaned up unused imports across multiple pages/components.
• Removed an obsolete backend connectivity helper from the frontend entrypoint.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/frontend/src/pages/processPage.tsx	Removes unused Fluent UI imports.
src/frontend/src/pages/modernizationPage.tsx	Removes unused React hook imports, deletes unused enums, and adjusts file-fetch code.
src/frontend/src/pages/landingPage.tsx	Removes unused upload state and simplifies the upload state-change handler.
src/frontend/src/pages/batchView.tsx	Narrows ../api/utils imports to (mostly) only what’s used.
src/frontend/src/main.jsx	Removes unused checkConnection helper.
src/frontend/src/components/bottomBar.tsx	Removes unused useNavigate import.
src/frontend/src/components/batchHistoryPanel.tsx	Cleans React imports (but currently introduces a missing useRef import).
src/frontend/src/commonComponents/ProgressModal/progressModal.tsx	Removes unused “blocking” extraction logic.

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🎉 This PR is included in version 2.1.1 🎉

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