Move Stylo to its own repo (#31350)

* Remove packages that were moved to external repo

* Add workspace dependencies pointing to 2023-06-14 branch

* Fix servo-tidy.toml errors

* Update commit to include #31346

* Update commit to include servo/stylo#2

* Move css-properties.json lookup to target/doc/stylo

* Remove dependency on vendored mako in favour of pypi dependency

This also removes etc/ci/generate_workflow.py, which has been unused
since at least 9e71bd6a70.

* Add temporary code to debug Windows test failures

* Fix failures on Windows due to custom target dir

* Update commit to include servo/stylo#3

* Fix license in tests/unit/style/build.rs

* Document how to build with local Stylo in Cargo.toml

etc/ci/generate_workflow.py

@@ -1,58 +0,0 @@
-# Copyright 2021 The Servo Project Developers. See the COPYRIGHT
-# file at the top-level directory of this distribution.
-#
-# Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-# http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-# <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-# option. This file may not be copied, modified, or distributed
-# except according to those terms.
-
-import os.path
-import sys
-
-BASE = os.path.dirname(__file__.replace('\\', '/'))
-sys.path.insert(0, os.path.join(
-    BASE, "..", "..", "components", "style", "properties", "Mako-1.1.2-py2.py3-none-any.whl"
-))
-
-from mako import exceptions  # noqa
-from mako.lookup import TemplateLookup  # noqa
-from mako.template import Template  # noqa
-
-
-def abort(message):
-    print(message, file=sys.stderr)
-    sys.exit(1)
-
-
-def render(filename, **context):
-    try:
-        lookup = TemplateLookup(directories=[BASE],
-                                input_encoding="utf8",
-                                strict_undefined=True)
-        template = Template(open(os.path.join(BASE, filename), "rb").read(),
-                            filename=filename,
-                            input_encoding="utf8",
-                            lookup=lookup,
-                            strict_undefined=True)
-        # Uncomment to debug generated Python code:
-        # write("/tmp", "mako_%s.py" % os.path.basename(filename), template.code)
-        return template.render(**context)
-    except Exception:
-        # Uncomment to see a traceback in generated Python code:
-        # raise
-        abort(exceptions.text_error_template().render())
-
-
-def main():
-    with open(os.path.join(".github", "workflows", "main.yml"), 'w') as f:
-        f.write(render(
-            'workflow.mako',
-            total_chunks=20,
-            REPOSITORY_NAME="${{ github.event.repository.name }}",
-            CODESIGN_CERT="${{ secrets.WINDOWS_CODESIGN_CERT }}",
-        ))
-
-
-if __name__ == "__main__":
-    main()