Remove rules associated with the auto-merge label (#48227)

This label has been removed as part of the effort to clean-up the labels in the repo. So these rules don't work anymore. During the conversation with some team members it sounded like the current behavior is preferable.

.github/fabricbot.json

@@ -1548,30 +1548,6 @@
         ]
       }
     },
-    {
-      "taskType": "trigger",
-      "capabilityId": "AutoMerge",
-      "subCapability": "AutoMerge",
-      "version": "1.0",
-      "config": {
-        "taskName": "Auto Merge PRs",
-        "label": "auto-merge",
-        "minMinutesOpen": "60",
-        "mergeType": "squash",
-        "removeLabelOnPush": true,
-        "conditionalMergeTypes": [
-          {
-            "mergeType": "merge",
-            "condition": {
-              "placeholder": "labels",
-              "operator": "contains",
-              "label_name": "Type: Merge Forward :fast_forward:"
-            }
-          }
-        ],
-        "deleteBranches": true
-      }
-    },
     {
       "taskType": "trigger",
       "capabilityId": "IssueResponder",
@@ -2015,58 +1991,6 @@
         ]
       }
     },
-    {
-      "taskType": "trigger",
-      "capabilityId": "IssueResponder",
-      "subCapability": "PullRequestResponder",
-      "version": "1.0",
-      "config": {
-        "conditions": {
-          "operator": "and",
-          "operands": [
-            {
-              "name": "isAction",
-              "parameters": {
-                "action": "opened"
-              }
-            },
-            {
-              "name": "isActivitySender",
-              "parameters": {
-                "user": "dotnet-maestro-bot"
-              }
-            },
-            {
-              "name": "titleContains",
-              "parameters": {
-                "titlePattern": "Merge branch"
-              }
-            },
-            {
-              "name": "prTargetsBranch",
-              "parameters": {
-                "branchName": "main"
-              }
-            }
-          ]
-        },
-        "eventType": "pull_request",
-        "eventNames": [
-          "pull_request",
-          "issues",
-          "project_card"
-        ],
-        "taskName": "[Infrastructure PRs] Add auto-merge label to branch merge Pull Requests in main",
-        "actions": [
-          {
-            "name": "addLabel",
-            "parameters": {
-              "label": "auto-merge"
-            }
-          }
-        ]
-      }
-    },
     {
       "taskType": "scheduled",
       "capabilityId": "ScheduledSearch",