Add migration docs for runner Helm chart and new tokens
What does this MR do and why?
Add caveats about using new runner tokens and helm chart
Releated things:
- gitlab-org/charts/gitlab-runner!410 (diffs)
- https://gitlab.com/gitlab-org/gitlab-runner/blob/ffa0b5050ff8537065f199b93c24afcb43414f6f/commands/register.go#L518-518
- https://gitlab.slack.com/archives/CBQ76ND6W/p1686580546322559
- gitlab-com/support/support-team-meta#5193 (closed)
MR acceptance checklist
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