fix(presign): remove storage baseUri configuration

[andrewazores]

See cryostatio/cryostat-operator#1146 (comment)
Depends on cryostatio/cryostat#1078
Based on #263

[andrewazores]

Tested and confirmed that this is working with external storage and presigned transfers for reports/datasource (see linked Cryosat PR and linked dependencies).

helm install --set storage.provider.url=https://s3.us-east-005.backblazeb2.com --set storage.storageSecretName=s3cred --set storage.provider.region=us-east-1 --set storage.provider.usePathStyleAccess=false --set storage.provider.metadata.storageMode=metadata --set core.route.enabled=true --set authentication.openshift.enabled=true --set core.discovery.kubernetes.enabled=true --set core.discovery.kubernetes.namespaces='{apps1}' --set core.image.repository=quay.io/andrewazores/cryostat --set core.image.tag=external-s3-baseuri-1 --set reports.image.repository=quay.io/andrewazores/cryostat-reports --set reports.image.tag=external-s3-1 --set datasource.image.repository=quay.io/andrewazores/jfr-datasource --set datasource.image.tag=external-s3-1 cryostat --set reports.replicas=1 ./charts/cryostat