servo: Merge #19065 - Import WebGL tests separately from web-platform-tests (from MortimerGoro:webgl_wpt); r=jdm

Import WebGL tests separately from web-platform-tests

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See https://github.com/servo/servo/issues/17140

Changes included in this PR:

- Move  webgl tests  from web-platform-tests to mozilla tests
- Create a mach command to allow easy updating from Khronos WebGL upstream ( `./mach update-webgl` or  `./mach update-webgl --version 1.0.3`)
- Fix WebGL patches to make them compatible with upstream.
- Sync with upstream 1.0.3 WebGL conformance suite using the new `./mach update-webgl` command

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #17140 (github issue number if applicable).

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- [x] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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Source-Repo: https://github.com/servo/servo
Source-Revision: b74f52d6df118d832db08276ebe698fee2fa2265

servo/python/tidy/servo_tidy/tidy.py

@@ -53,7 +53,7 @@ FILE_PATTERNS_TO_CHECK = ["*.rs", "*.rc", "*.cpp", "*.c",
                           "*.yml"]
 
 # File patterns that are ignored for all tidy and lint checks.
-FILE_PATTERNS_TO_IGNORE = ["*.#*", "*.pyc", "fake-ld.sh"]
+FILE_PATTERNS_TO_IGNORE = ["*.#*", "*.pyc", "fake-ld.sh", "*.ogv", "*.webm"]
 
 SPEC_BASE_PATH = "components/script/dom/"