fix(codeql): make languages a required field in CodeqlConfig

An empty languages list yields no findings — making it required forces
operators to explicitly configure which languages to check. Updated the
default extensions_cfg.yaml with example values.

Author: akiioto

src/odg/extensions_cfg.py

@@ -941,7 +941,7 @@ class CodeqlConfig(BacklogItemMixins):
     delivery_service_url: str
     interval: int = 60 * 60 * 24  # 24h
     on_unsupported: WarningVerbosities = WarningVerbosities.WARNING
-    languages: list[str] = dataclasses.field(default_factory=list)
+    languages: list[str]
 
     def is_supported(
         self,

src/odg/extensions_cfg.yaml

@@ -75,7 +75,7 @@ ghas:
 
 codeql:
   enabled: False
-  # languages: [Go, Python, Java, JavaScript, TypeScript, C, C++, C#, Kotlin, Ruby, Swift]
+  languages: []  # required, e.g. [go, python, javascript-typescript]
 
 issue_replicator:
   enabled: False