Fix handling comments in labeled statements (#6984)

changelog_unreleased/javascript/pr-6984.md

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+#### Fix formatting of labeled statements with comments ([#6994](https://github.com/prettier/prettier/pull/6984) by [@clement26695](https://github.com/clement26695))
+
+Formatting of comments in labeled statements was not stable
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+loop1:
+//test
+const i = 3;
+
+// Prettier stable (first output)
+loop1: //test
+const i = 3;
+
+// Prettier stable (second output)
+//test
+loop1: const i = 3;
+
+// Prettier master (first output)
+//test
+loop1: const i = 3;
+```