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

servo-tidy.toml

@@ -66,11 +66,6 @@ packages = [
 # Files that are ignored for all tidy and lint checks.
 files = [
     "./components/net/tests/parsable_mime/text",
-    # Ignore selectors and style files to avoid diverging too much from upstream Gecko
-    "./components/selectors/",
-    "./components/style/",
-    "./components/style_derive/parse.rs",
-    "./components/to_shmem/lib.rs",
     "./resources/hsts_preload.json",
     "./tests/wpt/meta/MANIFEST.json",
     "./tests/wpt/meta-legacy-layout/MANIFEST.json",
@@ -90,8 +85,6 @@ files = [
     "./tests/wpt/mozilla/tests/css/fonts",
     "./tests/wpt/mozilla/tests/css/pre_with_tab.html",
     "./tests/wpt/mozilla/tests/mozilla/textarea_placeholder.html",
-    # Python 3 syntax causes "E901 SyntaxError" when flake8 runs in Python 2
-    "./components/style/properties/build.py",
     # The tidy tests currently don't pass tidy.
     "./python/tidy/test.py",
 ]