Drop obsoleted upgrade path (obsoleted releases: 8.6, 8.9, 9.0, 9.3)

This is followup on announced changed from commit 5a3bded.
The support for noted RHEL releases ends on May 2024, hence the
upgrade paths related to these releases are dropped.

Jira: OAMG-10452

Author: pirat89

repos/system_upgrade/common/files/upgrade_paths.json

@@ -1,19 +1,16 @@
 {
     "default": {
-        "7.9": ["8.6", "8.8", "8.9", "8.10"],
-        "8.6": ["9.0"],
+        "7.9": ["8.8", "8.10"],
         "8.8": ["9.2"],
-        "8.9": ["9.3"],
         "8.10": ["9.4"],
-        "7": ["8.6", "8.8", "8.9", "8.10"],
-        "8": ["9.0", "9.2", "9.3", "9.4"]
+        "7": ["8.8", "8.10"],
+        "8": ["9.2", "9.4"]
     },
     "saphana": {
-        "7.9": ["8.6", "8.10", "8.8"],
-        "7": ["8.6", "8.10", "8.8"],
-        "8.6": ["9.0"],
+        "7.9": ["8.10", "8.8"],
+        "7": ["8.10", "8.8"],
         "8.8": ["9.2"],
         "8.10": ["9.4"],
-        "8": ["9.0", "9.4", "9.2"]
+        "8": ["9.4", "9.2"]
     }
 }

repos/system_upgrade/common/libraries/config/version.py

@@ -16,7 +16,7 @@
 _SUPPORTED_VERSIONS = {
     # Note: 'rhel-alt' is detected when on 'rhel' with kernel 4.x
     '7': {'rhel': ['7.9'], 'rhel-alt': [], 'rhel-saphana': ['7.9']},
-    '8': {'rhel': ['8.6', '8.8', '8.9', '8.10'], 'rhel-saphana': ['8.6', '8.8', '8.10']},
+    '8': {'rhel': ['8.8', '8.10'], 'rhel-saphana': ['8.8', '8.10']},
 }