Migrate vue components to setup (#32329)

Migrated a handful Vue components to the `setup` syntax using
composition api as it has better Typescript support and is becoming the
new default in the Vue ecosystem.

- [x] ActionRunStatus.vue    
- [x] ActivityHeatmap.vue
- [x] ContextPopup.vue       
- [x] DiffFileList.vue
- [x] DiffFileTree.vue       
- [x] DiffFileTreeItem.vue    
- [x] PullRequestMergeForm.vue
- [x] RepoActivityTopAuthors.vue  
- [x] RepoCodeFrequency.vue
- [x] RepoRecentCommits.vue
- [x] ScopedAccessTokenSelector.vue

Left some larger components untouched for now to not go to crazy in this
single PR:
- [ ] DiffCommitSelector.vue  
- [ ] RepoActionView.vue
- [ ] RepoContributors.vue
- [ ] DashboardRepoList.vue  
- [ ] RepoBranchTagSelector.vue

web_src/js/utils/time.ts

@@ -42,14 +42,14 @@ export function firstStartDateAfterDate(inputDate: Date): number {
   return resultDate.valueOf();
 }
 
-type DayData = {
+export type DayData = {
   week: number,
   additions: number,
   deletions: number,
   commits: number,
 }
 
-export function fillEmptyStartDaysWithZeroes(startDays: number[], data: DayData): DayData[] {
+export function fillEmptyStartDaysWithZeroes(startDays: number[], data: DayData[]): DayData[] {
   const result = {};
 
   for (const startDay of startDays) {