update namespace of webhook to be set dynamically

[Jooho]

Description

Webhook clientConfig namespace is not set dynamically and it affects e2e tests for kserve.
This PR uses params.env to set the namespace in the webhook object.

How Has This Been Tested?

kustomize build ./config/base > /tmp/a.yaml

grep namespace /tmp/a.yaml

if don't see mesh-namespace, it succeeds.

expected output:

  namespace: opendatahub
  namespace: opendatahub
  - namespaces
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
              fieldPath: metadata.namespace
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
  namespace: opendatahub
      namespace: opendatahub

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[VedantMahabaleshwarkar]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jooho, mwaykole, spolti, VedantMahabaleshwarkar

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