feat: collect VS Code diagnostics in support bundles

[EhabY]

Summary

• add vscode-logs/settings.json with inspect-style coder.* / remote.* settings and redaction for coder.headerCommand and coder.binarySource
• store the active Coder SSH proxy log as vscode-logs/proxy/active.log while keeping recent proxy logs under vscode-logs/proxy/
• collect actual Remote-SSH logs and recent cross-session Coder extension logs under stable session/window paths
• split support bundle diagnostics into src/supportBundle/ modules for ZIP mutation, log discovery, and settings collection

Follow-up

• Split point (4) into Prompt to create support bundle before Reload Window on SSH failure #970 because failure prompting needs a lifecycle-safe Remote-SSH failure detector/log watcher.

Tests

• pnpm format:check
• pnpm lint
• pnpm typecheck
• pnpm test:extension ./test/unit/supportBundle/appendVsCodeLogs.test.ts
• pnpm test:extension

Closes #955.
Refs #970.

Generated by Coder Agents.