Flaky test: TestAccAksGoSdk

[thomas11]

Currently our second-flakiest test.

❯ gh flaky
[...]
Note: append the failed job URL suffixes to 'https://github.com/pulumi/pulumi-azure-native/actions/runs/'.

Examined 177 workflow runs, out of which 33 succeeded after retries.
Found 46 failed jobs, out of which 33 had logs available.

Failures  Test              Failed jobs
---------------------------------------
15        TestAccSimpleTs   9382488111/job/25836385401, 8968850165/job/24629862481, 8819790165/job/24212697752, 8751921168/job/24019203636, ...
13        TestAccAksGoSdk   8751921168/job/24089045929, 8328320633/job/22789401658, 9417409856/job/25943410757, 9417409856/job/26006104288, ...

Cause of the failure is always

 +  azure-native:containerservice:ManagedCluster cluster **creating failed** error: Code="ServicePrincipalNotFound" Message="Searching service principal failed. Details: service principal is not found"

Example run