Refactor event and session column names to camelCase

- Updated test cases to reflect new column names (eve_MAC -> eveMac, eve_DateTime -> eveDateTime, etc.) across various test files.
- Modified SQL table definitions in the database cleanup and migration tests to use camelCase naming conventions.
- Implemented migration tests to ensure legacy column names are correctly renamed to camelCase equivalents.
- Ensured that existing data is preserved during the migration process and that views referencing old column names are dropped before renaming.
- Verified that the migration function is idempotent, allowing for safe re-execution without data loss.

front/plugins/_publisher_pushover/config.json

@@ -31,7 +31,7 @@
   "params": [],
   "database_column_definitions": [
     {
-      "column": "Index",
+      "column": "index",
       "css_classes": "col-sm-2",
       "show": true,
       "type": "none",
@@ -46,7 +46,7 @@
       ]
     },
     {
-      "column": "Plugin",
+      "column": "plugin",
       "css_classes": "col-sm-2",
       "show": false,
       "type": "label",
@@ -65,7 +65,7 @@
       ]
     },
     {
-      "column": "Object_PrimaryID",
+      "column": "objectPrimaryId",
       "css_classes": "col-sm-2",
       "show": false,
       "type": "label",
@@ -80,7 +80,7 @@
       ]
     },
     {
-      "column": "Object_SecondaryID",
+      "column": "objectSecondaryId",
       "css_classes": "col-sm-2",
       "show": true,
       "type": "label",
@@ -95,7 +95,7 @@
       ]
     },
     {
-      "column": "Watched_Value1",
+      "column": "watchedValue1",
       "css_classes": "col-sm-1",
       "show": true,
       "type": "eval",
@@ -115,7 +115,7 @@
       ]
     },
     {
-      "column": "Watched_Value2",
+      "column": "watchedValue2",
       "css_classes": "col-sm-2",
       "show": true,
       "type": "textarea_readonly",
@@ -130,7 +130,7 @@
       ]
     },
     {
-      "column": "Watched_Value3",
+      "column": "watchedValue3",
       "css_classes": "col-sm-2",
       "show": true,
       "type": "label",
@@ -145,7 +145,7 @@
       ]
     },
     {
-      "column": "Watched_Value4",
+      "column": "watchedValue4",
       "css_classes": "col-sm-2",
       "show": false,
       "type": "device_mac",
@@ -160,7 +160,7 @@
       ]
     },
     {
-      "column": "UserData",
+      "column": "userData",
       "css_classes": "col-sm-2",
       "show": false,
       "type": "textbox_save",
@@ -179,7 +179,7 @@
       ]
     },
     {
-      "column": "Status",
+      "column": "status",
       "css_classes": "col-sm-1",
       "show": false,
       "type": "replace",
@@ -215,7 +215,7 @@
       ]
     },
     {
-      "column": "Extra",
+      "column": "extra",
       "css_classes": "col-sm-3",
       "show": false,
       "type": "label",