Set Env to define POD_NAMESPACE

[vaibhavjainwiz]

odh-model-controller should aware about the namespace in which controller pod is running. POD_NAMESPACE is the env which read by controller for it. POD_NAMESPACE is used by odh-model-controller while creating the generic route to read inferenceservice-config configmap to read ingress configurations.
https://github.com/opendatahub-io/odh-model-controller/blob/main/controllers/reconcilers/kserve_route_reconciler.go#L77

With this PR I am initializing the POD_NAMESPACE env. It is required for #67

Description

How Has This Been Tested?

It could be tested with #100

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

[rpancham]

Verified the changes of this PR along with #111

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: israel-hdez, vaibhavjainwiz

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