Optimize flex layout of release attachment area (#34885)

before:

![b975dce7-d5b1-43e0-b6f4-94557758e30e](https://github.com/user-attachments/assets/c33f3fd0-ce1a-457c-97fe-942b86cf09c1)

after:

![682ce03c-9d2c-4b5d-9ba0-fb759fd98088](https://github.com/user-attachments/assets/55304b19-a3c3-4a91-b07a-0c9868dbe3eb)

web_src/css/repo/release-tag.css

@@ -70,8 +70,12 @@
   flex-wrap: wrap;
 }
 
+#release-list .release-entry .attachment-list > .item a {
+  min-width: 300px;
+}
+
 #release-list .release-entry .attachment-list .attachment-right-info {
-  flex-grow: 1;
+  flex-shrink: 0;
   min-width: 300px;
 }