test: Add fail case for Proxy remote write

[philipgough]

This test case will fail and shows that remote write implementation always returns a 200 status code. This is problematic from a data loss perspective since it means failed requests wont be retried

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: philipgough

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[sonarcloud]

Quality Gate failed

Failed conditions
D Reliability Rating on New Code (required ≥ A)

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[openshift-ci]

@philipgough: 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
ci/prow/sonar-pre-submit	22ea2d7	link	true	/test sonar-pre-submit
ci/prow/test	22ea2d7	link	true	/test test

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