fix build uncorrect status

[zouyee]

Fixes #599

Proposed Changes

• check build status before stop it.

Release Note

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[knative-prow-robot]

@zouyee: 0 warnings.

In response to this:

Fixes ##599

Proposed Changes

• check build status before stop it.

Release Note

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[knative-metrics-robot]

The following is the coverage report on pkg/.
Say /test pull-knative-build-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/build/timeout_handler.go	67.3%	67.9%	0.6

[imjasonh]

Hi @zouyee -- sorry it's taken so long to get to this PR 😅

If this bug is still outstanding and reproducible, please add a test case that faiils without your code change to prevent accidentally regressing in some future refactor. A unit test change would also be nice.

[imjasonh]

Closing this as stale, please reopen if you think this is still something we should do.