E2E tests: support running all tests on PRs (#7146)

Allow usage of `all` test tag.

### QA Notes

Author: testlabauto

scripts/pr-e2e-comment.sh

@@ -11,7 +11,7 @@ COMMENT_MARKER="$1"  # e.g., "<!-- PR Tags -->"
 TAGS="$2"            # e.g., "@:critical,@:quarto"
 
 # Ensure required arguments are provided
-if [ -z "$COMMENT_MARKER" ] || [ -z "$TAGS" ]; then
+if [ -z "$COMMENT_MARKER" ]; then
   echo "Usage: $0 \"<comment_marker>\" \"<tags>\""
   exit 1
 fi
@@ -37,8 +37,12 @@ COMMENTS=$(gh api repos/${REPO}/issues/${PR_NUMBER}/comments --header "Authoriza
 # Check if a comment with the marker already exists
 COMMENT_ID=$(echo "$COMMENTS" | jq -r ".[] | select(.body | contains(\"$COMMENT_MARKER\")) | .id")
 
-# Format the tags with individual backticks
-FORMATTED_TAGS=$(echo "$TAGS" | sed 's/,/` `/g' | sed 's/^/`/' | sed 's/$/`/')
+# Format the tags with individual backticks, or use default
+if [ -z "$TAGS" ]; then
+  FORMATTED_TAGS="\`@:all\`"
+else
+  FORMATTED_TAGS=$(echo "$TAGS" | sed 's/,/` `/g' | sed 's/^/`/' | sed 's/$/`/')
+fi
 
 # Add the "🚨 RED ALERT!" note
 RED_ALERT_NOTE="<!-- \n🚨 RED ALERT! ✋ Rule breaker detected! Tags don’t go here, they belong above ^ in the PR description using this proper format: \`@:tag\`. Changing them here won't do anything (trust us, we’ve tried). Confused? Check out the README hyperlink.\n-->"

scripts/pr-tags-parse.sh

@@ -31,20 +31,20 @@ PR_BODY=$(echo "$PULL_REQUEST_BODY" | tr '\n' ' ' | sed 's/"/\\"/g')
 
 echo "Parsing tags from PR body..."
 
+if echo "$PR_BODY" | grep -q "@:win"; then
+	echo "Found win tag in PR body. Setting to run windows tests."
+	echo "win_tag_found=true" >> "$GITHUB_OUTPUT"
+fi
+if echo "$PR_BODY" | grep -q "@:web"; then
+	echo "Found web tag in PR body. Setting to run web tests."
+	echo "web_tag_found=true" >> "$GITHUB_OUTPUT"
+fi
+
 # Check if @:all is present in the PR body
 if echo "$PR_BODY" | grep -q "@:all"; then
   echo "Found @:all tag in PR body. Setting tags to run all tests."
   TAGS="" # Set to an empty string to indicate all tests should run
 else
-  if echo "$PR_BODY" | grep -q "@:win"; then
-    echo "Found win tag in PR body. Setting to run windows tests."
-    echo "win_tag_found=true" >> "$GITHUB_OUTPUT"
-  fi
-  if echo "$PR_BODY" | grep -q "@:web"; then
-    echo "Found web tag in PR body. Setting to run web tests."
-    echo "web_tag_found=true" >> "$GITHUB_OUTPUT"
-  fi
-
   # Parse tags starting with '@:'
   TAGS=$(echo "$PR_BODY" | grep -o "@:[a-zA-Z0-9_-]*" | tr '\n' ',' | sed 's/,$//')
 
@@ -56,10 +56,10 @@ else
       TAGS="@:critical"
     fi
   fi
-fi
 
-# Output the tags
-echo "Extracted Tags: $TAGS"
+	# Output the tags
+	echo "Extracted Tags: $TAGS"
+fi
 
 # Save tags to GITHUB_OUTPUT for use in GitHub Actions
 if [[ -n "$GITHUB_OUTPUT" ]]; then