✨ envtest: respect pre-configured binary paths in ControlPlane

[mzhaom]

This commit fixes an issue where Environment.Start() would ignore pre-configured binary paths (APIServer.Path, Etcd.Path, KubectlPath) set in ControlPlane when DownloadBinaryAssets is false.

Changes:

• Extract path configuration logic into configureBinaryPaths() method for better testability and separation of concerns
• Only auto-configure binary paths when they are empty (not pre-set)
• When DownloadBinaryAssets is true, downloaded paths are still used (preserving existing behavior)
• Update ControlPlane field documentation to clarify path behavior
• Add tests in envtest_test.go to verify path handling logic

This fixed issue #3373

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[alvaroaleman]

/ok-to-test

[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

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Git tree hash: ca3d731cdfa749d190a57bda673da3baa21ff43d

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mzhaom, sbueringer

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[alvaroaleman]

/cherrypick release-0.22

[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #3377

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In response to this:

/cherrypick release-0.22

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