Remove old code from HL7Reader that is used places other than UP

[adegolier]

Problem statement

Deprecated code that is only used in the CLI should be removed from HL7Reader.kt

What you need to know

HL7Reader.getMessageProfile() and HL7Reader.profileDirectoryMap used only in ProcessFhirCommands.convertHl7ToFhir() should be removed and the use of it refactored to use current strategies. Along with removing this, the private val oidProfileMap can also be removed as it is only referenced in the getMessageProfile() function.

Acceptance criteria

• HL7Reader.getMessageProfile(), HL7Reader.profileDirectoryMap, and HL7Reader.oidProfileMap are removed from HL7Reader
• ProcessFhirCommands.convertHl7toFhir() is refactored to not need these things