Don't show AbortErrors on logout (#29639) (#29667)

Backport #29639.

When logging out of Gitea, a error toast can be seen for a split second.
I don't know why or how it happens but I found it it's an `AbortError`
(related to
[AbortController#abort](https://developer.mozilla.org/en-US/docs/Web/API/AbortController/abort)),
so let's hide it.

web_src/js/features/common-global.js

@@ -101,9 +101,11 @@ async function fetchActionDoRequest(actionElem, url, opt) {
  showErrorToast(`server error: ${resp.status}`);
  }
  } catch (e) {
- console.error('error when doRequest', e);
  actionElem.classList.remove('is-loading', 'small-loading-icon');
- showErrorToast(i18n.network_error);
+ if (e.name !== 'AbortError') {
+ console.error('error when doRequest', e);
+ showErrorToast(i18n.network_error);
+ }
  }
 }