Add channel mapping for release/7.0-preview5-8 (#2399)

Author: LoopedBard3

scripts/channel_map.py

@@ -2,6 +2,26 @@
 
 class ChannelMap():
     channel_map = {
+        'release/7.0-preview8': {
+            'tfm': 'net7.0',
+            'branch': '7.0.1xx',
+            'quality': 'daily'
+        },
+        'release/7.0-preview7': {
+            'tfm': 'net7.0',
+            'branch': '7.0.1xx',
+            'quality': 'daily'
+        },
+        'release/7.0-preview6': {
+            'tfm': 'net7.0',
+            'branch': '7.0.1xx',
+            'quality': 'daily'
+        },
+        'release/7.0-preview5': {
+            'tfm': 'net7.0',
+            'branch': '7.0.1xx',
+            'quality': 'daily'
+        },
         'release/7.0-preview4': {
             'tfm': 'net7.0',
             'branch': '7.0.1xx',