Use generic manifest.yaml name for manifest in generated lowcode CDK connectors(#21770)

Author: sherifnada

airbyte-integrations/connector-templates/source-configuration-based/source_{{snakeCase name}}/{{snakeCase name}}.yaml.hbs renamed to airbyte-integrations/connector-templates/source-configuration-based/source_{{snakeCase name}}/manifest.yaml.hbs

@@ -15,4 +15,4 @@ WARNING: Do not modify this file.
 # Declarative Source
 class Source{{properCase name}}(YamlDeclarativeSource):
     def __init__(self):
-        super().__init__(**{"path_to_yaml": "{{snakeCase name}}.yaml"})
+        super().__init__(**{"path_to_yaml": "manifest.yaml"})