[ENHANCEMENT:] Update .gitignore to not allow new AI skills directory to be included in the repos .github folder... (hashicorp#31798)

Author: WodansSon

.gitignore

@@ -60,8 +60,9 @@ tf.zip
 # do not upload GitHub Copilot specific folders and copilot instruction files
 .github/instructions
 .github/prompts
+.github/skills
 .github/copilot-instructions.md
 
 # do not upload .bob instructions
 .bob
-AGENTS.md
+AGENTS.md