Refactor termination and rental object entities

- Removed the "Kündigungen" field from the German and English rental object JSON files.
- Updated the termination JSON files to reflect new field names and structure, including renaming "kuendigungsart" to "beendigungsTatbestand" and "kuendigungsgrund" to "kuendigungsgrund" with updated options.
- Deleted the old "CKuendigung" entity definition and related metadata, consolidating functionality into "CKndigung".
- Adjusted the service logic to accommodate the new structure, ensuring proper linking of landlords and tenants.
- Updated dynamic visibility logic for fields based on conditions related to termination reasons and delivery methods.
- Cleaned up metadata definitions for both termination and rental object entities, removing unnecessary relationships and fields.
- Incremented cache and microtime values in the configuration file.

custom/Espo/Custom/Resources/metadata/clientDefs/CKuendigung.json

@@ -1,55 +0,0 @@
-{
-    "controller": "controllers/record",
-    "boolFilterList": [
-        "onlyMy"
-    ],
-    "iconClass": "fas fa-file-contract",
-    "sidePanels": {
-        "detail": [
-            {
-                "name": "activities",
-                "reference": "activities"
-            },
-            {
-                "name": "history",
-                "reference": "history"
-            },
-            {
-                "name": "tasks",
-                "reference": "tasks"
-            }
-        ]
-    },
-    "bottomPanels": {
-        "detail": [
-            {
-                "name": "activities",
-                "reference": "activities",
-                "disabled": true
-            },
-            {
-                "name": "history",
-                "reference": "history",
-                "disabled": true
-            }
-        ]
-    },
-    "relationshipPanels": {
-        "vermieter": {
-            "layout": null,
-            "selectPrimaryFilterName": null
-        },
-        "mieter": {
-            "layout": null,
-            "selectPrimaryFilterName": null
-        },
-        "dokumenteKuendigung": {
-            "layout": null,
-            "selectPrimaryFilterName": null
-        },
-        "contactsKuendigung": {
-            "layout": null,
-            "selectPrimaryFilterName": "portalUsers"
-        }
-    }
-}