feat: Add Available Models Support for Embeddings component (#11320)

* Remove Markdown support from URLComponent starter projects

Eliminated the 'markitdown' dependency and Markdown output option from the URLComponent in Blog Writer, Knowledge Ingestion, and Simple Agent starter projects. Updated the code and configuration to only support 'Text' and 'HTML' output formats. Also added a 'Local' storage option to Document Q&A, News Aggregator, and Portfolio Website Code Generator starter projects.

* Update component_index.json

* [autofix.ci] apply automated fixes

* Reset flows

* reset flows

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* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes

* Update component_index.json

* [autofix.ci] apply automated fixes

* fix ruff issues

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* [autofix.ci] apply automated fixes (attempt 2/3)

* [autofix.ci] apply automated fixes (attempt 3/3)

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