Remove unused visitor portal helpers

Brand and public file serving replaced the old org/portal
logo and report URL generators, leaving dead methods and
unused Service fields behind.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/probod/probod.go

@@ -676,9 +676,6 @@ func (impl *Implm) Run(
 		s3Client,
 		impl.cfg.AWS.Bucket,
 		baseURL.String(),
-		impl.cfg.TrustCenter.BaseDomain,
-		impl.cfg.GetSlackSigningSecret(),
-		iamService,
 		esignService,
 		html2pdfConverter,
 		fileManagerService,