fix: set proxy the old way for mdsd in golang

[bragi92]

Adding in the changes for this ICM fix which was missed : https://github.com/Azure/prometheus-collector/pull/864/files

PR Description

New Feature Checklist

• List telemetry added about the feature.
• Link to the one-pager about the feature.
• List any tasks necessary for release (3P docs, AKS RP chart changes, etc.) after merging the PR.
• Attach results of scale and perf testing.

Tests Checklist

• Have end-to-end Ginkgo tests been run on your cluster and passed? To bootstrap your cluster to run the tests, follow these instructions.
  • Labels used when running the tests on your cluster:
    • operator
    • windows
    • arm64
    • arc-extension
    • fips
• Have new tests been added? For features, have tests been added for this feature? For fixes, is there a test that could have caught this issue and could validate that the fix works?
  • Is a new scrape job needed?
    • The scrape job was added to the folder test-cluster-yamls in the correct configmap or as a CR.
  • Was a new test label added?
    • A string constant for the label was added to constants.go.
    • The label and description was added to the test README.
    • The label was added to this PR checklist.
    • The label was added as needed to testkube-test-crs.yaml.
  • Are additional API server permissions needed for the new tests?
    • These permissions have been added to api-server-permissions.yaml.
  • Was a new test suite (a new folder under /tests) added?
    • The new test suite is included in testkube-test-crs.yaml.

[bragi92]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[bragi92]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).