Fetch tag notes on release refresh

What does this MR do and why?

A couple fixes ensuring that tag notes are available when creating a release, to ensure they are included when the user selects the relevant option.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screen_Recording_2024-01-08_at_9.30.21_AM

Screen_Recording_2024-01-08_at_9.42.01_AM

Screen_Recording_2024-01-08_at_9.42.48_AM

How to set up and validate locally

1. Create an annotated tag for a repository
2. Fill out the new release form using that tag
3. refresh the page
4. create the release
5. Verify tag message is included in release notes.

For #429809 (closed)

app/assets/javascripts/releases/stores/modules/edit_new/getters.js

@@ -170,13 +170,11 @@ export const releaseDeleteMutationVariables = (state) => ({
   },
 });
 
-export const formattedReleaseNotes = ({
-  includeTagNotes,
-  release: { description, tagMessage },
-  tagNotes,
-  showCreateFrom,
-}) => {
-  const notes = showCreateFrom ? tagMessage : tagNotes;
+export const formattedReleaseNotes = (
+  { includeTagNotes, release: { description, tagMessage }, tagNotes },
+  { isNewTag },
+) => {
+  const notes = isNewTag ? tagMessage : tagNotes;
   return includeTagNotes && notes
     ? `${description}\n\n### ${s__('Releases|Tag message')}\n\n${notes}\n`
     : description;