UI: Fix overflow issues in repo (#7190)

- Fix layout overflow in repo file list.
- Fix invisible status icon in file view and commit list. In file view,
  the icon was moved to the left because I could not figure out a proper
  fix because of HTML tables.
- Added title attribute to commit messages.
- Fixed two CSS linter warnings in existing CSS.
- Fixed CI variable check in 'make css'.

Fixes: https://github.com/go-gitea/gitea/issues/7180

public/less/_repository.less

@@ -2219,6 +2219,19 @@ tbody.commit-list {
     vertical-align: baseline;
 }
 
+.commit-list .message-wrapper {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    max-width: calc(100% - 24px);
+    display: inline-block;
+    vertical-align: middle;
+}
+
+.commit-list .message-wrapper .commit-status-link {
+    display: inline-block;
+    vertical-align: middle;
+}
+
 .commit-body {
     white-space: pre-wrap;
 }