Remove slash-commands-example extension (#52835)

Follow-up to https://github.com/zed-industries/zed/pull/52757

Release Notes:

- N/A

.github/CODEOWNERS.hold

@@ -161,7 +161,6 @@
 /extensions/glsl/ @zed-industries/ecosystem-team
 /extensions/html/ @zed-industries/ecosystem-team
 /extensions/proto/ @zed-industries/ecosystem-team
-/extensions/slash-commands-example/ @zed-industries/ecosystem-team
 /extensions/test-extension/ @zed-industries/ecosystem-team
 /extensions/workflows/ @zed-industries/ecosystem-team
 

.github/workflows/extension_auto_bump.yml

@@ -7,7 +7,6 @@ on:
     - main
     paths:
     - extensions/**
-    - '!extensions/slash-commands-example/**'
     - '!extensions/test-extension/**'
     - '!extensions/workflows/**'
     - '!extensions/*.md'
@@ -28,16 +27,23 @@ jobs:
         CHANGED_FILES="$(git diff --name-only "$COMPARE_REV" "$GITHUB_SHA")"
         # Detect changed extension directories (excluding extensions/workflows)
         CHANGED_EXTENSIONS=$(echo "$CHANGED_FILES" | grep -oP '^extensions/[^/]+(?=/)' | sort -u | grep -v '^extensions/workflows$' || true)
+        # Filter out deleted extensions
+        EXISTING_EXTENSIONS=""
+        for ext in $CHANGED_EXTENSIONS; do
+            if [ -f "$ext/extension.toml" ]; then
+                EXISTING_EXTENSIONS=$(printf '%s\n%s' "$EXISTING_EXTENSIONS" "$ext")
+            fi
+        done
+        CHANGED_EXTENSIONS=$(echo "$EXISTING_EXTENSIONS" | sed '/^$/d')
         if [ -n "$CHANGED_EXTENSIONS" ]; then
             EXTENSIONS_JSON=$(echo "$CHANGED_EXTENSIONS" | jq -R -s -c 'split("\n") | map(select(length > 0))')
         else
             EXTENSIONS_JSON="[]"
         fi
-        # Filter out newly added or entirely removed extensions
+        # Filter out newly added extensions
         FILTERED="[]"
         for ext in $(echo "$EXTENSIONS_JSON" | jq -r '.[]'); do
-            if git show HEAD~1:"$ext/extension.toml" >/dev/null 2>&1 && \
-               [ -f "$ext/extension.toml" ]; then
+            if git show HEAD~1:"$ext/extension.toml" >/dev/null 2>&1; then
                 FILTERED=$(echo "$FILTERED" | jq -c --arg e "$ext" '. + [$e]')
             fi
         done

.github/workflows/run_tests.yml

@@ -106,6 +106,14 @@ jobs:
         check_pattern "run_tests" '^(docs/|script/update_top_ranking_issues/|\.github/(ISSUE_TEMPLATE|workflows/(?!run_tests))|extensions/)' -qvP
         # Detect changed extension directories (excluding extensions/workflows)
         CHANGED_EXTENSIONS=$(echo "$CHANGED_FILES" | grep -oP '^extensions/[^/]+(?=/)' | sort -u | grep -v '^extensions/workflows$' || true)
+        # Filter out deleted extensions
+        EXISTING_EXTENSIONS=""
+        for ext in $CHANGED_EXTENSIONS; do
+            if [ -f "$ext/extension.toml" ]; then
+                EXISTING_EXTENSIONS=$(printf '%s\n%s' "$EXISTING_EXTENSIONS" "$ext")
+            fi
+        done
+        CHANGED_EXTENSIONS=$(echo "$EXISTING_EXTENSIONS" | sed '/^$/d')
         if [ -n "$CHANGED_EXTENSIONS" ]; then
             EXTENSIONS_JSON=$(echo "$CHANGED_EXTENSIONS" | jq -R -s -c 'split("\n") | map(select(length > 0))')
         else