Fix YAML injections in the network policy enforcement test

[dlapcevic]

Remove label key templating from the YAML files to pass the YAML injection checks introduced in #2421

Example error message from test failure:

reading template (deployment.yaml) error: replacing placeholders error: YAML Injection Detected

Similar for the Network Policy Enforcement measurement:

NetworkPolicyEnforcement - NetworkPolicyEnforcement error: error while creating test client deployment: TemplateToObject error: replacing placeholders error: YAML Injection Detected

/kind bug

[dlapcevic]

/assign @marseel

/cc @alan-kut

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/assign @marseel

/cc @alan-kut

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[dlapcevic]

/retest

[k8s-ci-robot]

@dlapcevic: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-perf-tests-clusterloader2	7782916	link	true	/test pull-perf-tests-clusterloader2
pull-perf-tests-clusterloader2-kubemark	7782916	link	true	/test pull-perf-tests-clusterloader2-kubemark

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[dlapcevic]

Hi @marseel, could we merge this since the failures are due to N2 machine quotas, and not related to the change.
Another PR has just been merged despite these failures #2483

I tested the change. Our tests that were previously broken are now passing with this.

[marseel]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dlapcevic, marseel

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