fix: do not review - fix Ubuntu2204 HTTPSProxy PrivateDNS CSE exit50 kubelet

[SriHarsha001]

What this PR does / why we need it: Mitigates PR-gate flakiness for [Test_Ubuntu2204_HTTPSProxy_PrivateDNS] affected by the transient exit‑50 outbound preflight failure. The mitigation is deliberately narrow: it retries only on CSE exit code 50, bounded to [maxOutboundCSERetries]. Any other failure, or a consistently-failing exit‑50, still fails the test.

Which issue(s) this PR fixes:

Fixes # https://msazure.visualstudio.com/CloudNativeCompute/_workitems/edit/38559852

[Copilot]

Pull request overview

This PR updates the e2e VMSS provisioning harness to mitigate a known transient Linux CSE failure where the outbound connectivity preflight exits with ERR_OUTBOUND_CONN_FAIL (exit code 50). The approach is to detect that specific failure mode in the Azure VMExtensionProvisioningError payload and recreate the VMSS a bounded number of times to reduce PR-gate flakes.

Changes:

• Add a bounded recreate loop in ConfigureAndCreateVMSS that retries VMSS creation when the failure is classified as transient exit-50.
• Introduce cseExitCodeOutboundConnFail = "50" and a helper classifier isTransientOutboundCSEFailure(err).
• Add unit tests to pin the exit code constant and validate the classifier behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
e2e/vmss.go	Adds bounded recreate-on-exit-50 logic, plus helper functions for classification and synchronous VMSS deletion.
e2e/vmss_test.go	Adds tests for the exit code constant and the transient-failure classifier.
e2e/const.go	Introduces a named constant for the CSE outbound connectivity failure exit code (50).

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.