Remove the TS_EXPERIMENTAL_KUBE_API_EVENTS env var from the operator and its
helm chart. This has already been marked as deprecated, and has been
scheduled to be removed in release 1.96.
Add a check in helm chart to fail if the removed variable is set to true,
prompting users to move to ACLs instead.
Fixes: #18875
Signed-off-by: Becky Pauley <becky@tailscale.com>
faf7f2bc45