Remove duplicate dashboard.json- fixes the Kyverno/Grafana/Loki cypress test

General MR

Summary

Removes the duplicate dashboard.json that was causing dashboards not to load for Grafana for kyverno.

Big Bang kyverno has a duplicate dashboard.json \ kyverno-dashboard.json that was causing the grafana dashboard database to lock so dashboards across the board were not populating due to upstream kyverno helm chart renaming the json file, the kpt pkg update --strategy alpha-git-patch brought in the newly renamed (kyverno-dashboard.json) json file without removing the old one (dashboard.json)

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

Links to big-bang/bigbang#2232 (closed)

Upgrade Notices

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