Fix date display

[crosskayla]

Issue

On the homepage dashboard to the right, where it says [Patient Name] | [Age] years | Gender:

• A patient birthdate of, for example, "2000-08-01" will incorrectly return 24 years on the homepage
• It should return the correct age 23 years (since the birthday has not passed yet this year).

I believe this was an issue because it was somehow parsing the year but not the month and day of the birthDate, at least when there are multiple patient objects in the DB.

Fix

Check if it is an array before calculating age.

Other considerations

It is not an issue in SourceDetailComponent's function getPatientAge(), because that uses a flattener helper method getPath(). I can centralize this logic instead in the PR, if you'd like.

[CLAassistant]

All committers have signed the CLA.

[AnalogJ]

this is great, thanks for the PR @crosskayla !

I'm ok with the code duplication for now. We'll need to make significant changes to the frontend FHIR resource processing soon.