Remove MariaDb/MySQL Support

[AviGawande]

This PR closes/references issue #189 .

How has this been tested?

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Remove MariaDB/MySQL support from the project by updating database configuration settings and CI workflows to exclude MariaDB/MySQL dependencies and setup.

Enhancements:

• Remove support for MariaDB/MySQL from the database configuration settings.

CI:

• Update CI workflow to exclude MariaDB/MySQL from the testing matrix and remove related setup steps.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes support for MariaDB/MySQL databases from the project. The changes primarily affect the database configuration settings and the CI workflow, simplifying the codebase by focusing on SQLite and PostgreSQL as the supported database backends.

File-Level Changes

Change	Details	Files
Remove MariaDB/MySQL specific database configuration	Remove MySQL-specific character set and collation settings Remove conditional logic for MySQL database options Remove MySQL-specific test database configuration	src/pretalx/settings.py
Update CI workflow to remove MySQL/MariaDB testing	Remove MySQL from the database matrix in GitHub Actions Remove MariaDB setup step from the workflow Remove installation of MySQL client and dependencies	.github/workflows/tests.yml

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[sourcery-ai]

Hey @AviGawande - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please provide a detailed explanation for removing MySQL/MariaDB support. What motivated this decision, and how does it align with the project's goals?
• Address the impact on existing MySQL users. Is there a migration path or guidance for users who need to switch databases?
• Consider updating the PR description with more context about the change, including any performance or maintenance benefits this removal might bring.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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