Handle xhtml when validating FHIR resources

[Wambere]

Ref: https://onaio.slack.com/archives/C07NVDFENS0/p1729073384102089
Ref: https://github.com/onaio/fhir-resources/actions/runs/11353530934/job/31578753433?pr=3494#step:7:2

Error occurs if we have something like this on the resource

      "text": {
        "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">Application Config</div>"
      }

Error:

[sharon2719]

@dubdabasoduba @ndegwamartin @Wambere I did a bit of debugging and noticed that a missing HTML tag caused the issue. If the text section is necessary then this is the format it should have

"text": {
		  "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">{{ 2dbb3571e8c151bb27742165beb7358d }}</div>"
		}

This will ensure that the error will not be experienced cc @pld