Fix vertical centering of file tree icons and use entryIcon for submodules/symlinks (#34137)

In the file tree, the icons are not vertically centered, which affects
the overall visual consistency.
Currently, the icons of submodules and symlinks do not adopt the value
of entryIcon, resulting in inconsistent icon display.

before:
![3000-gogitea-gitea-y4ulxr46c4k ws-us118 gitpod io_test_test
gitea_src_branch_main_README md
(3)](https://github.com/user-attachments/assets/d521b89f-909a-43f9-8f39-787b0243b159)

after:
![3000-gogitea-gitea-y4ulxr46c4k ws-us118 gitpod io_test_test
gitea_src_branch_main_README md
(2)](https://github.com/user-attachments/assets/4866807f-c890-4709-b595-7086011e5231)

---------

Co-authored-by: silverwind <me@silverwind.io>

web_src/js/components/RepoContributors.vue

@@ -375,7 +375,7 @@ export default defineComponent({
     <div class="tw-flex ui segment main-graph">
       <div v-if="isLoading || errorText !== ''" class="gt-tc tw-m-auto">
         <div v-if="isLoading">
-          <SvgIcon name="octicon-sync" class="tw-mr-2 job-status-rotate"/>
+          <SvgIcon name="octicon-sync" class="tw-mr-2 circular-spin"/>
           {{ locale.loadingInfo }}
         </div>
         <div v-else class="text red">