fix(kuma-cp): override grafana plugin files by default

[slonka]

override grafana plugin files so the container does not crash loop on docker restart because the files already exist

Signed-off-by: slonka slonka@users.noreply.github.com

Checklist prior to review

• Link to docs PR or issue -- no docs needed
• Link to UI issue or PR -- not ui issue
• Is the issue worked on linked? -- not reported, small fix
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) -- yes
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS -- yes
• Unit Tests -- updated golden files
• E2E Tests -- no need
• Manual Universal Tests -- not universal issue
• Manual Kubernetes Tests -- done via kubectl exec
• Do you need to update UPGRADE.md? -- no
• Does it need to be backported according to the backporting policy? -- no
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests? -- no