Accessibility: Create project fixes

[ksierks]

What does this PR do and why?

Resolves ART-8948, ART-8962 & ART-10360.

Screenshots or screen recordings

Project URL is required:

Project path errors:

Project description errors:

How to set up and validate locally

1. Turn on screen reader.
2. Navigate to the project dashboard within irida-next.
3. Click the New project button.
4. Verify the screen reader announces the URL field is required.
5. Try submitting the form with an invalid path and description.
6. Verify all the errors are announced.

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the PR acceptance checklist for this PR.

[github-actions]

Code Metrics Report

Coverage	Test Execution Time
96.2%	16m36s

Code coverage of files in pull request scope (96.8%)

Files	Coverage
app/views/projects/_project_namespace_fields.html.erb	96.8%

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Reported by octocov