fix(server): return the correct file on multiple files with same name

[tessus]

Description

The glob_match_file function returns the wrong entry. glob yields paths in alphabetical order. We want the file with the longest expiry date/time.

Motivation and Context

fixes #218

How Has This Been Tested?

• manually
• cargo test
• fixtures

Changelog Entry

### Changed

- Fixed an erroneous `file not found` occurrence

Types of Changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (no code change)
• [ ] Refactor (refactoring production code)
• [ ] Other

Checklist:

• [x] My code follows the code style of this project.
• [ ] I have updated the documentation accordingly.
• [x] I have formatted the code with rustfmt.
• [x] I checked the lints with clippy.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

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[tessus]

I thought about it for a while and it won't break anything.

But I see an issue that has nothing to do with this or the previous PRs: One can upload multiple files with the same name, but that was already possible with the curl -F "file=@x.txt;filename=wow.nice" command when random_url was not set. This case was never taken into consideration. We can look into this in a separate discussion or issue.

[tessus]

I created a separate discussion #241

Can you think of any edge cases that this would break backwards compatibility?

A bit more info:

If multiple files with the same name are on the server, the file with the longest expiry timestamp will be returned when accessing the file via curl <server>/file.txt

Previously a different file was returned. Which one is not entirely clear depending on expiration but not yet cleaned from disk, and so on.

But this was never a defined behavior anyway, thus no breaking change.