docs,helm: disable controller on non-ECS

[huww98]

What type of PR is this?

/kind bug /kind documentation

What this PR does / why we need it:

To fix panic in NAS controller because of missing region ID.

Dynamic NAS is not supported by default on non-ECS cluster.

Add a regionID value, in case someone want to hack with this. Note that currently deleting NAS volume relies on storage-operator, which is not supported on non-ECS cluster. So we do not recommend this in the doc.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

/cc @tydra-wang

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[mowangdk]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huww98, mowangdk, tydra-wang

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