Fix unit test cli in prow script not returning correct exit code

[davidheryanto]

Previously, when running unit test for CLI, the return code is the return code of the "tee" command NOT the "test" command. Hence it was always successful and we might miss failing Feast CLI unit tests.

[feast-ci-bot]

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[davidheryanto]

/test unit-test-cli

[feast-ci-bot]

@davidheryanto: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
unit-test-cli	f945355	link	/test unit-test-cli

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[davidheryanto]

NOTE:
OK for unit-test-cli to fail in this pull request.
Need to fix that in another pull request.

[zhilingc]

/lgtm