Use resolve() for DiagnosticReport

[mrunibe]

The current workaround to resolve references in DiagnosticReport is very slow for large Bundles, see Zulip discussion

Change to resolve() once available in matchbox and validator_cli

Related PR:

• FML resolve() in Bundle hapifhir/org.hl7.fhir.core#1944
• resolve in fml ahdis/matchbox#362