Remove deprecated serverless library link from project creation

[Copilot]

Overview

Removes the "View sample projects" link from the project creation language selection dialog, as the Azure serverless community library is being deprecated.

Changes

• NewProjectLanguageStep.ts: Removed the "View sample projects" option from the language picker and the associated logic that opened https://aka.ms/AA4ul9b
• README.md: Removed the reference to the Azure serverless community library from the extension description

Before

Users would see a "View sample projects" link at the bottom of the language selection dialog during project creation:

Clicking this link would open the serverless library website in a browser.

After

The language selection dialog now only shows the available language options without the "View sample projects" link. Users can proceed directly with project creation by selecting their preferred language.

Technical Details

• Removed unused imports: UserCancelledError and openUrl
• Updated type definition for languagePicks to remove the | undefined union type since there are no longer any undefined data values
• Simplified the language filter logic by removing the redundant p.data !== undefined check

Fixes #4740

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove serverless library link</issue_title>
<issue_description>The serverless library is being deprecated so we need to remove the "View sample projects" link from the project creation experience.

I'll delete the aka.ms link once this is removeed.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #4742

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