[24.x] Disable rule AS0077 in MAIN branch (#3201) (#3442)

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#### Summary <!-- Provide a general summary of your changes --> Rule

https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/analyzers/appsourcecop-as0077
should only be enabled in release branches, as the rule only applies in
hotfix scenarios.

#### Work Item(s) <!-- Add the issue number here after the #. The issue
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Fixes
[AB#568822](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/568822)

Author: JesperSchulz

src/rulesets/ruleset.json

@@ -59,6 +59,11 @@
       "action": "None",
       "justification": "Unsafe methods cannot be invoked in an AppSource application"
     },
+    {
+      "id": "AS0077",
+      "action": "None",
+      "justification": "Adding a var modifier in events should be allowed in main, as it only will break the runtime behavior of extensions subscribing to it when used in hotfix scenarios."
+    },
     {
       "id": "AS0081",
       "action": "None",