Makefile: Use the full git commit hash when building binaries

[timflannagan]

Update the root Makefile and copy-paste the GIT_COMMIT from the
staging/operator-lifecycle-manager/Makefile that checks if any of the
ART-defined environment variables are present in the build environment,
and falling back to the full git commit hash.

This is important as there's existing tests in openshift/origin that
verify that full commit hash is present when running the
version/--version command/flags for the OLM and registry binaries.

[timflannagan]

Link to a rehearsal that caught this when attempting to promote from the downstream monorepo instead of the upstream equivalents: https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/openshift_release/17323/rehearse-17323-pull-ci-openshift-operator-framework-olm-release-4.9-e2e-gcp/1376992350034726912.

[timflannagan]

Need to land this before merging openshift/release #17323.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: timflannagan

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[exdx]

/lgtm

[openshift-ci]

@timflannagan: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-upgrade	eb653bc	link	/test e2e-upgrade

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[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.