Add Progress Bar to File Upload Modal

[pranavrao145]

Proposed Changes

Closes #5401 by adding a progress bar to the file upload modal on the submissions page.

Screenshot

The progress bar is hard to catch in action, but here is a screenshot of what it looks like moments before the modal itself closes (i.e. once the file has been completely uploaded):

Type of Change

(Write an X or a brief description next to the type or types that best describe your changes.)

Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)	X
🐛 Bug fix (non-breaking change that fixes an issue)
🎨 User interface change (change to user interface; provide screenshots)	X
♻️ Refactoring (internal change to codebase, without changing functionality)
🚦 Test update (change that only adds or modifies tests)
📦 Dependency update (change that updates a dependency)
🔧 Internal (change that only affects developers or continuous integration)

Checklist

Before opening your pull request:

• I have performed a self-review of my changes.
  • Check that all changed files included in this pull request are intentional changes.
  • Check that all changes are relevant to the purpose of this pull request, as described above.
• I have added tests for my changes, if applicable.
  • This is required for all bug fixes and new features.
• I have updated the project documentation, if applicable.
  • This is required for new features.

After opening your pull request:

• I have updated the project Changelog (this is required for all changes).
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• I have verified that the CI tests have passed.
• I have reviewed the test coverage changes reported by Coveralls.
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[david-yz-liu]

@pranavrao145 great job. Regarding the failing tests, sadly it's not an issue on your end, and I just made a PR to fix it. Update your branch from the latest master and the tests should be fixed.

[coveralls]

Pull Request Test Coverage Report for Build 9202569520

Details

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 91.423%

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Totals
Change from base Build 9165923791:	0.05%
Covered Lines:	40000
Relevant Lines:	43079

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💛 - Coveralls