Source: Deflake and Parallelize Tests

[abursavich]

Description

This makes Source tests run much faster and deterministically:

• When comparing lists of endpoints, those with the same DNS name but different targets are sorted consistently.
• When validating endpoints, compare ProviderSpecific and SetIdentifier fields.
• Test resources (services, ingresses, etc.) are created before the Source, which eliminates informer timing issues.
• Connector Source tests, which run a TCP server, pick any open port instead of using fixed ports which may be taken. Also close the listener.
• All Source tests that rely on informer synchronization have been parallelized. Locally, this drops the running time from 30s+ to ~5s.

Prelude to #2045

Checklist

• Unit tests updated
• End user documentation updated (N/A)

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[seanmalloy]

/kind cleanup

[seanmalloy]

/cc

[njuettner]

That is awesome! Thank you @abursavich

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abursavich, njuettner

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[njuettner]

/lgtm