feat: Promote first user to admin superuser + remove default admin user

Walkthrough

The pull request introduces significant changes to the authentication configuration across multiple files. It removes specific admin user setup environment variables and adds new variables that enhance general authentication settings. Additionally, workflow configurations have been updated to allow manual execution, and error handling improvements have been made in user registration processes. These changes streamline the setup and management of authentication while enhancing error handling and flexibility in the application.

Changes

File	Change Summary
`.env.example`	Removed `TRACECAT__SETUP_ADMIN_EMAIL`, `TRACECAT__SETUP_ADMIN_PASSWORD`; added `TRACECAT__AUTH_ALLOWED_DOMAINS`, `TRACECAT__AUTH_MIN_PASSWORD_LENGTH`.
`.github/workflows/test-python.yml`	Added `workflow_dispatch` trigger; updated permissions; removed `TRACECAT__SETUP_ADMIN_EMAIL` and `TRACECAT__SETUP_ADMIN_PASSWORD`.
`docker-compose.dev.yml`	Added `TRACECAT__AUTH_ALLOWED_DOMAINS`, `TRACECAT__AUTH_MIN_PASSWORD_LENGTH`; removed `TRACECAT__SETUP_ADMIN_EMAIL`, `TRACECAT__SETUP_ADMIN_PASSWORD`.
`docker-compose.yml`	Added `TRACECAT__AUTH_ALLOWED_DOMAINS`, `TRACECAT__AUTH_MIN_PASSWORD_LENGTH`; removed `TRACECAT__SETUP_ADMIN_EMAIL`, `TRACECAT__SETUP_ADMIN_PASSWORD`.
`env.sh`	Removed user prompts for admin email and password; deleted password validation logic.
`frontend/src/components/auth/sign-up.tsx`	Enhanced error handling in `BasicRegistrationForm` for registration errors.
`tests/conftest.py`	Added `TRACECAT__AUTH_ALLOWED_DOMAINS` to `env_sandbox`; updated `test_admin_user` fixture to use dynamic values.
`tracecat/api/app.py`	Added exception handler for `FastAPIUsersException`; removed logic for creating default admin user.
`tracecat/auth/users.py`	Added `InvalidDomainException`; enhanced user management with new validation methods.
`tracecat/config.py`	Added `TRACECAT__AUTH_ALLOWED_DOMAINS` and `TRACECAT__AUTH_MIN_PASSWORD_LENGTH` configuration variables.
`tracecat/registry/client.py`	Updated error handling in `call_action` method to check if `detail` is a mapping.
`pyproject.toml`	Added dependency `email-validator` with version constraint `>=2.0.0`.

Possibly related PRs

#509: The changes in the main PR regarding the removal of admin user setup variables and the addition of authentication-related variables are directly related to the modifications in the docker-compose.dev.yml and docker-compose.yml files in PR #509, which also remove the same admin user setup variables and add new authentication settings.
#513: Although primarily focused on adding SSO variables, this PR is related as it enhances the overall authentication infrastructure, which aligns with the changes made in the main PR regarding authentication configuration.

Suggested labels

internal, infrastructure

Suggested reviewers

topher-lo

Poem

🐰 In the meadow where bunnies play,
New settings bloom, brightening the day.
Admin paths have faded away,
With domains and passwords, come what may!
Hop along, let errors be clear,
A joyful change, let’s give a cheer! 🌼

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