More actionable "will contain a secret" warning

[blampe]

When exporting to YAML we can emit a warning "YAML will contain a secret value in plaintext" but we don't include enough information to help the user understand which specific output is leaking secrets.

pulumi-kubernetes/provider/pkg/provider/provider.go

Lines 1573 to 1577 in 8a0d0c3

	if k.yamlRenderMode {
	if checkedInputs.ContainsSecrets() {
	_ = k.host.Log(ctx, diag.Warning, urn, "rendered YAML will contain a secret value in plaintext")
	}
	}