Allow opentelemetry dependency updates (#3935)

updates dependabot rules and allows updating dependencies from
    go.opentelemetry.io/*
    github.com/open-telemetry/*

.github/dependabot.yml

@@ -15,3 +15,25 @@ updates:
     reviewers:
       - "elastic/elastic-agent-control-plane"
     open-pull-requests-limit: 10
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    labels:
+      - automation
+      - skip-changelog
+      - Team:Elastic-Agent
+    groups:
+        otel-dependencies:
+            patterns:
+             - "*"
+            update-types:
+             - "minor"
+             - "patch"
+    allow:
+      # Only update internal dependencies for now while we evaluate this workflow.
+      - dependency-name: "go.opentelemetry.io/collector/*"
+      - dependency-name: "github.com/open-telemetry/opentelemetry-collector-contrib/*"
+    reviewers:
+      - "elastic/elastic-agent-control-plane"
+    open-pull-requests-limit: 10