Fix broken path in validation

[Wambere]

While trying to validate a PR with the following structure

project_name
| - apps
|   | - registers
|   |   | - some_config.json
| - patient
|   | - sample_patient.json

We get the following error

EFSITY: :: INFO  :: Starting FHIR resource validation
EFSITY: :: INFO  :: Input file path project_name/app/registers/some_config.jsonproject_name/patient/sample_patient.json
SLF4J: No SLF4J providers were found.
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See https://www.slf4j.org/codes.html#noProviders for further details.
EFSITY: :: INFO  :: project_name/app/registers/some_config.jsonproject_name/patient/sample_patient.json
java.lang.RuntimeException: java.nio.file.NoSuchFileException: 

This issue is to figure out why the path is off, it's combining the two instead of looking for each and validating them one at a time

For more context:

• https://github.com/onaio/fhir-resources/pull/3746
• https://github.com/onaio/fhir-resources/actions/runs/12904277794/job/35981289167