Remove "Assign to Coding Agent" command (moved to Copilot Chat extension)

[Copilot]

The issue.startCodingAgentFromTodo command referenced by the TODO lightbulb "Delegate to agent" quick fix no longer exists in this extension, resulting in a "command not found" error. This functionality is moving to the Copilot Chat extension.

Removes all remaining "assign/delegate to coding agent" surface area:

• issueFeatureRegistrar.ts: Remove issue.assignToCodingAgent command registration and assignToCodingAgent() method
• package.json: Remove command definition, command palette suppression entry, and issues tree view context menu entry
• package.nls.json: Remove command.issue.assignToCodingAgent.title localization string
• IssueFeatures.md: Remove stale "Delegate to coding agent" and CodeLens references (no CodeLens provider exists)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Can't delegate to agent from TODO lightbulb</issue_title>
<issue_description>

• Add a TODO in my code
• Use lightbulb to Delegate to agent
• ❓ I'm getting command 'issue.startCodingAgentFromTodo' not found. I wonder if this is a carry-over from bringing coding agent functionality from GHPR into the chat extension?

</issue_description>

<agent_instructions>remove all the 'delegate to agent' code lens and quick fix code. We'll move this to the copilot chat extension</agent_instructions>

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

@bamurtaugh > What I don't know is where "delegate to agent" has moved to. Would love to still be able to use that.

Thank you for the feedback. Here are our docs on other methods of agent interaction and delegation: https://code.visualstudio.com/docs/copilot/agents/overview. If we can help clarify anything else in the meantime, definitely please let us know!</comment_new>

• Fixes Can't delegate to agent from TODO lightbulb vscode#292398

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