Fix inconsistent quoting in diffRangeExtensionPackContents and empty initial line

lib/entry-points.js

@@ -185926,8 +185926,7 @@ async function setupDiffInformedQueryRun(logger2, checkoutPath) {
   );
 }
 function diffRangeExtensionPackContents(ranges, checkoutPath) {
-  const header = `
-extensions:
+  const header = `extensions:
   - addsTo:
       pack: codeql/util
       extensible: restrictAlertsTo
@@ -185936,7 +185935,7 @@ extensions:
 `;
   let data = ranges.map((range2) => {
     const filename = path16.join(checkoutPath, range2.path).replaceAll(path16.sep, "/");
-    return `      - [${dump(filename, { forceQuotes: true, quoteStyle: "single" }).trim()}, ${range2.startLine}, ${range2.endLine}]
+    return `      - [${dump(filename, { forceQuotes: true, quoteStyle: "double" }).trim()}, ${range2.startLine}, ${range2.endLine}]
 `;
   }).join("");
   if (!data) {

src/analyze.ts

@@ -319,8 +319,7 @@ export function diffRangeExtensionPackContents(
   ranges: DiffThunkRange[],
   checkoutPath: string,
 ): string {
-  const header = `
-extensions:
+  const header = `extensions:
   - addsTo:
       pack: codeql/util
       extensible: restrictAlertsTo
@@ -341,7 +340,7 @@ extensions:
       // characters are escaped, and that the path is always rendered as a
       // quoted string on a single line.
       return (
-        `      - [${yaml.dump(filename, { forceQuotes: true, quoteStyle: "single" }).trim()}, ` +
+        `      - [${yaml.dump(filename, { forceQuotes: true, quoteStyle: "double" }).trim()}, ` +
         `${range.startLine}, ${range.endLine}]\n`
       );
     })