* adds api service
* adds missing copyright headers
* Update ui/app/services/api.ts
Co-authored-by: claire bontempo <68122737+hellobontempo@users.noreply.github.com>
* removes response cache and comments from api service
* removes hide warnings condition from showWarnings middleware in api service
* splits out setHeaders test
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Co-authored-by: claire bontempo <68122737+hellobontempo@users.noreply.github.com>
