Fix missing text after code blocks and missing code blocks, in @vscode responses

[jruales]

Fix for issues appearing in microsoft/vscode#269351 (comment).

1. Fixes the issue where some of the text was missing from after each codeblock returned by the @vscode participant
2. Fixes the issue where non-JSON code blocks were disappearing

Also cleans up unused properties showCodeBlock and codeBlock

[bhavyaus]

LGTM. Thanks!

[Copilot]

Pull Request Overview

This PR fixes two critical issues with the @vscode participant's response processing: missing text after code blocks and disappearing non-JSON code blocks. The fix ensures that all text content is properly displayed to users and that non-JSON code blocks are shown rather than being processed for settings/commands.

• Refactors the code block processing logic to properly handle text before and after code blocks
• Updates the parsing logic to skip non-JSON code blocks instead of trying to process them
• Removes unused properties from the VSCodeParticipantMetadata interface

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/extension/intents/node/vscodeIntent.ts	Refactors processNonReporting method and applyDelta method to properly handle text surrounding code blocks and ensure all content is displayed
src/extension/context/node/resolvers/vscodeContext.ts	Updates parseSettingsAndCommands function to return empty array for non-JSON blocks and removes unused showCodeBlock and codeBlock properties
src/extension/context/node/resolvers/test/vscodeContext.spec.ts	Adds comprehensive test suite covering various scenarios for the updated parsing logic