Update file names in local unit import modal

[shreeyash07]

Summary

Update file name label in local unit import modal.

Addresses

• Issue(s): https://github.com/toggle-corp/ifrc-go-meta/issues/559

Depends On

• Other PRs or Dependencies: Refactor bulk upload logic for XLSX file processing go-api#2575

Changes

• Make file accept xlsx instead of csv
• Update file name label from csv to xlsx

This PR Ensures:

• No typos or grammatical errors
• No conflict markers left in the code
• No unwanted comments, temporary files, or auto-generated files
• No inclusion of secret keys or sensitive data
• No console.log statements meant for debugging
• All CI checks have passed

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Latest commit: 229c013

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