test: extend audio/video codec tests

[mxschmitt]

Notes:

• movie.webm is not the same as big-buck-bunny-vp9.webm - movie.webm used vp8.
• movie.mp4 and big-buck-bunny-h264.mp4 is the same. both are using H.264 hence removed movie.mp4

[github-actions]

Test results for "tests 1"

1 failed
❌ [webkit-library] › library/capabilities.spec.ts:543:5 › Audio & Video codec playback › Theora (OGV container) @webkit-ubuntu-22.04-node18

5 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-aria.spec.ts:76:7 › should update aria snapshot highlight @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › page/page-evaluate.spec.ts:424:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-event-popup.spec.ts:28:3 › should work with window features @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

39142 passed, 823 skipped
✔️✔️✔️

Merge workflow run.