Modify STU3 FHIRPath constraints to fix/remove broken expressions.
Modify STU3 FHIRPath constraints to fix/remove broken expressions.

RiskAssessment.prediction:
"probability is decimal implies probability.as(decimal) <= 100"
https://jira.hl7.org/browse/FHIR-25796

OperationDefinition.parameter:
"searchType implies type = 'string'"
The fix applied in R4 is backported to STU3 in this change.

PiperOrigin-RevId: 300170942

google/fhir,google/fhir,google/fhir,google/fhir,google/fhir,google/fhir