Remove OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION from Dockerfile

The OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION environment variable is not
needed in the Dockerfile. It can be set during the make bundle command:

OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION=<version> make bundle

This ensures the bundle manifests have the environment variable
set for the controller pod.

This reverts commit e085621.

Author: lpiwowar

Dockerfile

@@ -26,10 +26,6 @@ RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o ma
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details
 FROM registry.access.redhat.com/ubi9/ubi-minimal:9.4
-
-ARG OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION
-ENV OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION=${OPENSHIFT_LIGHTSPEED_OPERATOR_VERSION}
-
 WORKDIR /
 COPY --from=builder /workspace/manager .
 USER 65532:65532