Grafana: move to its own role

Add DevOps/ansible-role-grafana as roles/ericomeehan.grafana with a
grafana.yaml playbook, and bump ericomeehan.eom to the commit that
removes Grafana from it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitmodules

@@ -121,3 +121,6 @@
 [submodule "roles/ericomeehan.luanti-wasm"]
 	path = roles/ericomeehan.luanti-wasm
 	url = git@gitea.eom.dev:Gaming/ansible-role-luanti-wasm.git
+[submodule "roles/ericomeehan.grafana"]
+	path = roles/ericomeehan.grafana
+	url = git@gitea.eom.dev:DevOps/ansible-role-grafana.git

grafana.yaml

@@ -0,0 +1,7 @@
+- name: Execute test
+  hosts: alpha-control-plane
+  become: true
+  vars_files:
+    - ../secrets.yaml
+  roles:
+    - role: ericomeehan.grafana