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/layouts/CKndigung/bottomPanelsDetail.json

@@ -23,7 +23,7 @@
     "_tabBreak_1": {
         "index": 2,
         "tabBreak": true,
-        "tabLabel": "Kündigende"
+        "tabLabel": "Vermieter"
     },
     "kuendiger": {
         "index": 3
@@ -31,7 +31,7 @@
     "_tabBreak_2": {
         "index": 4,
         "tabBreak": true,
-        "tabLabel": "Gekündigte"
+        "tabLabel": "Mieter"
     },
     "gekuendigte": {
         "index": 5
@@ -51,13 +51,5 @@
     },
     "dokumenteskuendigung": {
         "index": 9
-    },
-    "_tabBreak_5": {
-        "index": 10,
-        "tabBreak": true,
-        "tabLabel": "Mietobjekte"
-    },
-    "mietobjekte": {
-        "index": 11
     }
 }