feat: Add YouTube transcript extraction component and frontend integration

[Cristhianzl]

This pull request adds a new component for extracting transcripts from YouTube videos and integrates it into the frontend. The most important changes include the addition of the YouTubeTranscriptsComponent, updates to the frontend to support the new component, and a new test to verify its functionality.

Backend Changes:

• Added YouTubeTranscriptsComponent to import list and component registry in __init__.py (src/backend/base/langflow/components/tools/__init__.py) [1] [2].
• Implemented YouTubeTranscriptsComponent class to handle YouTube transcript extraction, including methods for building transcripts and creating a structured tool (src/backend/base/langflow/components/tools/youtube_transcripts.py).

Frontend Changes:

• Added YouTubeSvgIcon component to render the YouTube icon (src/frontend/src/icons/Youtube/index.tsx).
• Imported YouTubeIcon and added it to the nodeIconsLucide export in styleUtils.ts (src/frontend/src/utils/styleUtils.ts) [1] [2].

Testing:

• Added a new Playwright test to verify that users can use the YouTube transcripts component and extract transcripts from a video (src/frontend/tests/extended/integrations/youtube-transcripts.spec.ts).This pull request includes the addition of a new component to extract YouTube transcripts and various test cleanups. The most important changes include adding the YouTubeTranscriptsComponent, updating the __init__.py file to include this component, and removing redundant imports in several test files.

New Feature:

• Added YouTubeTranscriptsComponent to extract spoken content from YouTube videos as transcripts. (src/backend/base/langflow/components/tools/youtube_transcripts.py)

Initialization Updates:

• Updated __init__.py to include the new YouTubeTranscriptsComponent. (src/backend/base/langflow/components/tools/__init__.py) [1] [2]

[codspeed-hq]

CodSpeed Performance Report

Merging #4502 will degrade performances by 16.86%

_{Comparing cz/add-youtube-transcript-component (fe0cfb0) with main (7dfce1d)}

Summary

⚡ 2 improvements
❌ 2 regressions
✅ 11 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	cz/add-youtube-transcript-component	Change
⚡	test_build_flow_from_request_data	5,824.4 ms	785.2 ms	×7.4
❌	test_successful_run_with_input_type_any	456.5 ms	531.3 ms	-14.07%
⚡	test_successful_run_with_input_type_text	532.4 ms	455.4 ms	+16.91%
❌	test_successful_run_with_output_type_debug	379.2 ms	456.1 ms	-16.86%