Fix exports comment formats. (#12860)

* fix exports comment formats

* add tests

* add change log

* rename function name

* merge logic

* add tests to compare comment formats in `export` and `import`

changelog_unreleased/javascript/12860.md

@@ -0,0 +1,49 @@
+#### Fix comment formats in (#12860 by @HosokawaR)
+
+This change fixes comments format in `exports` to algin with the comment format in `import`
+
+Although this change does not affect the comments format in `import`, follows change log contains examples of comments in `import` for reference.
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+export {
+  foo,
+  
+  bar as  // comment
+		 baz,
+}
+
+import {
+  foo,
+  
+  bar as  // comment
+		 baz,
+} from 'foo'
+
+// Prettier stable
+export {
+  foo,
+  bar as baz, // comment
+};
+
+import {
+  foo,
+  // comment
+  bar as baz,
+} from "foo";
+
+// Prettier main
+export {
+  foo,
+  // comment
+  bar as baz,
+};
+
+import {
+  foo,
+  // comment
+  bar as baz,
+} from "foo";
+
+```