Fix whitespace rendering in diff (#13415)

- Introduce new .code-inner class that sets the CSS attributes on
rendered code lines like view,blame and diff.
- Rename .wrap class to .word-break to reflect what it actually does
- Remove .raw which was only used on webhook page
- Set white-space: pre-wrap except on blame where it can break the
layout

Fixes: https://github.com/go-gitea/gitea/issues/13406

web_src/less/_repository.less

@@ -3239,6 +3239,17 @@ td.blob-excerpt {
   padding-left: 8px;
 }
 
+.webhook-info {
+  padding: 7px 12px;
+  margin: 10px 0;
+  background-color: #f8f8f8;
+  border: 1px solid #dddddd;
+  border-radius: 3px;
+  font-size: 13px;
+  line-height: 1.5;
+  overflow: auto;
+}
+
 .title_wip_desc {
   margin-top: 1em;
 }