feat: Add an icon for the GUI application

[bdferris-v2]

Summary:

Replaces the default Java icon used for the packaged application.

Closes #1162

• Run the unit tests with gradle test to make sure you didn't break anything
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ bdferris-v2
❌ bdferris
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[bdferris-v2]

Note that I accidentally had one commit in this PR that used my [email protected] address (as opposed to [email protected]), so CLA Assistant is going to complain. Sorry I missed that!

[isabelle-dr]

Thank you so much @bdferris! LGTM. If you're not planning other additions, I can merge & publish the release (🎉)

[bdferris-v2]

I've got one more tweak for the in-app icon. Give me five minutes, almost there.

[isabelle-dr]

I'm surprised the Package Application didn't run, I thought it would be triggered on every commit?

[bdferris-v2]

@isabelle-dr it looks like it ran to me?

https://github.com/MobilityData/gtfs-validator/actions/runs/2436559851

[isabelle-dr]

Oh okay, it is Package Installers. It looks great!

[bdferris-v2]

@isabelle-dr the CLA Assistant is still blocking this, such that I don't think I can submit on my own. Do you have the power to override?

[isabelle-dr]

I do :)
Are you done on your end?

[bdferris]

Yep! Submit away!

…

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