chore: remove AI tools install from dotfiles — moved to dots-ai

- Remove run_onchange_before_install-ai-tools.sh.tmpl
- Remove github.copilot, github.copilot-chat AI extensions from VSCode script

Author: ulises-jeremias

home/.chezmoiscripts/linux/run_onchange_before_install-ai-tools.sh.tmpl

@@ -3,14 +3,13 @@
 {{ $extensions := list
      "eamodio.gitlens"
      "EditorConfig.EditorConfig"
-     "github.copilot"
-     "github.copilot-chat"
      "ms-python.python"
      "redhat.vscode-yaml"
      "streetsidesoftware.code-spell-checker"
      "yzhang.markdown-all-in-one"
      "VOSCA.vscode-v-analyzer"
 -}}
+{{- /* AI extensions (github.copilot, github.copilot-chat, claude-code) are managed by dots-ai */ -}}
 
 #!/usr/bin/env bash