Return a commit even if there's a polling error.

Recent Platform changes have resulted in every stageCommit call responding with "build planning".

`state import` does not care if the plan ultimately fails due to requirements not being found. It should still make the commit.

pkg/platform/model/buildplanner/commit.go

@@ -72,7 +72,7 @@ func (b *BuildPlanner) StageCommit(params StageCommitParams) (*Commit, error) {
 	if resp.Build.Status == raw.Planning {
 		resp.Build, err = b.pollBuildPlanned(resp.CommitID.String(), params.Owner, params.Project, nil)
 		if err != nil {
-			return nil, errs.Wrap(err, "failed to poll build plan")
+			return &Commit{resp, nil, nil}, errs.Wrap(err, "failed to poll build plan")
 		}
 	}