SAST errors in the cron aren't cleared between repos

[spencerschrock]

Describe the bug
The checkruns client doesn't reset errSetup error

scorecard/clients/githubrepo/checkruns.go

Lines 84 to 92 in ef77082

	func (handler *checkrunsHandler) init(ctx context.Context, repourl *repoURL, commitDepth int) {
	handler.ctx = ctx
	handler.repourl = repourl
	handler.commitDepth = commitDepth
	handler.logger = log.NewLogger(log.DefaultLevel)
	handler.checkData = new(checkRunsGraphqlData)
	handler.setupOnce = new(sync.Once)
	handler.checkRunsByRef = checkRunsByRef{}
	}

So once a cron worker encounters a SAST error, any repo it processes afterwards will short-circuit the SAST check:

scorecard/clients/githubrepo/checkruns.go

Lines 125 to 128 in ef77082

	func (handler *checkrunsHandler) listCheckRunsForRef(ref string) ([]clients.CheckRun, error) {
	if err := handler.setup(); err != nil {
	return nil, fmt.Errorf("error during graphqlHandler.setupCheckRuns: %w", err)
	}

Expected behavior
An error in one repo in the cron shouldn't affect the results for another