Ambient-package-update

* Fixed double-newline in .gitignore template

* Added configuration for ruff for file-based ignore rules (`PackageMetadata.ruff_file_based_ignore_list`)

* Fixed pre-commit hook trigger

* Removed pre-commit stage parameter where it wasn't necessary

* Small rendering bugfixes

* **Breaking change:** Renamed "company" field in package metadata to "licenser"
* **Breaking change:** Renamed "is_django_package" field in package metadata to "tests_require_django"
* **Breaking change:** Removed "freezegun" from dev dependencies
* Added development status classifiers constants
* Moved "typer" and "jinja2" to project dependencies
* Added shebang to UNIX scripts
* Added "gitignore_list" to package metadata to set custom exclude patterns
* Linter updates