Remove invalid releases automatically (#466)

Automatically remove empty releases or releases which are released in the future, regardless of the product.

Also refactored a bit releasedata.py to use better names and clarify types.

releases/bitbucket.json

@@ -28,15 +28,6 @@
       "name": "9.0",
       "eol": "2026-07-23"
     },
-    "8.9": {
-      "name": "8.9"
-    },
-    "8.8": {
-      "name": "8.8"
-    },
-    "8.7": {
-      "name": "8.7"
-    },
     "8.19": {
       "name": "8.19",
       "eol": "2026-03-12"
@@ -68,15 +59,6 @@
     "8.12": {
       "name": "8.12",
       "eol": "2025-07-11"
-    },
-    "8.11": {
-      "name": "8.11"
-    },
-    "8.10": {
-      "name": "8.10"
-    },
-    "7.21": {
-      "name": "7.21"
     }
   },
   "versions": {
@@ -106,7 +88,7 @@
     },
     "9.6.2": {
       "name": "9.6.2",
-      "date": "2025-05-13"
+      "date": "2025-05-14"
     },
     "9.4.6": {
       "name": "9.4.6",
@@ -134,7 +116,7 @@
     },
     "9.6.0": {
       "name": "9.6.0",
-      "date": "2025-03-17"
+      "date": "2025-03-18"
     },
     "9.5.2": {
       "name": "9.5.2",
@@ -154,7 +136,7 @@
     },
     "9.5.1": {
       "name": "9.5.1",
-      "date": "2025-02-10"
+      "date": "2025-02-11"
     },
     "9.4.3": {
       "name": "9.4.3",
@@ -186,7 +168,7 @@
     },
     "9.4.1": {
       "name": "9.4.1",
-      "date": "2024-12-09"
+      "date": "2024-12-10"
     },
     "8.19.13": {
       "name": "8.19.13",
@@ -402,7 +384,7 @@
     },
     "8.15.3": {
       "name": "8.15.3",
-      "date": "2024-01-08"
+      "date": "2024-01-09"
     },
     "8.14.4": {
       "name": "8.14.4",