Enable Typescript noImplicitThis (#33250)

- Enable https://www.typescriptlang.org/tsconfig/#noImplicitThis
- Wrap Vue Template-Syntax SFCs in
[`defineComponent`](https://vuejs.org/api/general#definecomponent) which
makes type inference and linter work better
- Move `createApp` calls outside the SFCs into separate files
- Use [`PropType`](https://vuejs.org/api/utility-types#proptype-t) where
appropriate
- Some top-level component properties changed order as dictated by the
linter
- Fix all tsc and lint issues that popped up during these refactors

web_src/js/features/repo-issue.ts

@@ -216,7 +216,7 @@ export function initRepoIssueCodeCommentCancel() {
 
 export function initRepoPullRequestUpdate() {
   // Pull Request update button
-  const pullUpdateButton = document.querySelector('.update-button > button');
+  const pullUpdateButton = document.querySelector<HTMLButtonElement>('.update-button > button');
   if (!pullUpdateButton) return;
 
   pullUpdateButton.addEventListener('click', async function (e) {