feat: web UI to delete authorized integration (#12632)

Adds a "Delete" option to the authorized integration list.

## Checklist

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### Tests for Go changes

- I added test coverage for Go changes...
  - [x] in their respective `*_test.go` for unit tests.
  - [ ] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I ran...
  - [x] `make pr-go` before pushing

### Tests for JavaScript changes

(can be removed for Go changes)

- I added test coverage for JavaScript changes...
  - [ ] in `web_src/js/*.test.js` if it can be unit tested.
  - [x] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).

### Documentation

- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.

### Release notes

- [x] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [ ] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12632
Reviewed-by: Andreas Ahlenstorf <aahlenst@noreply.codeberg.org>

templates/user/settings/authorized_integrations.tmpl

@@ -39,6 +39,10 @@
 							{{svg "octicon-pencil" 16 "tw-mr-1"}}
 							{{ctx.Locale.Tr "settings.authorized_integration.edit"}}
 						</a>
+						<button class="ui red tiny button delete-button" data-modal-id="delete-authorized-integration" data-url="{{$.Link}}/delete" data-id="{{.ID}}">
+							{{svg "octicon-trash" 16 "tw-mr-1"}}
+							{{ctx.Locale.Tr "settings.delete_token"}}
+						</button>
 					</div>
 				</div>
 			{{else}}
@@ -54,4 +58,15 @@
 	</div>
 </div>
 
+<div class="ui g-modal-confirm delete modal" id="delete-authorized-integration">
+	<div class="header">
+		{{svg "octicon-trash"}}
+		{{ctx.Locale.Tr "settings.authorized_integration.delete.header"}}
+	</div>
+	<div class="content">
+		<p>{{ctx.Locale.Tr "settings.authorized_integration.delete.body"}}</p>
+	</div>
+	{{template "base/modal_actions_confirm"}}
+</div>
+
 {{template "user/settings/layout_footer" .}}