TestSmartCollectorReassignment is flaky

[kevinearls]

TestSmartCollectorReassignment in cmd/otel-allocator/allocation/least_weighted_test.go fails frequently. I will add a t.skip() to prevent it from breaking CI

[secustor]

Fore reference, the PR which introduced the skip: #1233

[frzifus]

Same here:

https://github.com/open-telemetry/opentelemetry-operator/actions/runs/3584847719/jobs/6032050844#step:6:1174
https://github.com/open-telemetry/opentelemetry-operator/actions/runs/3585751516/jobs/6034118083#step:6:1172

[swiatekm]

This test was flaky because the behaviour it was checking wasn't what the strategy actually does. The least-weighted strategy is not stable - it's not guaranteed that if you allocate using the same sets of Collectors and Targets, you'll always get the same allocation.