## Description
A couple minor refactors. First, combines the
graph/service_helper.go and graph/service.go
files into a single file (just lift'n'shift, no logic
changes). Second, renames CreateHTTPClient
to just HTTPClient. Third, replaces the new
LargeItemClient constructor with extensible
options for the http client, starting with a
NoTimeout option. This will provide longer
term maintenance over multiple constructors.
This change sets up QoL for building multiple services
and clients within api layer handlers, which will appear
in an immediately following PR.
## Does this PR need a docs update or release note?
- [x] ⛔ No
## Type of change
- [x] 🧹 Tech Debt/Cleanup
## Issue(s)
* #2299
## Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
24911a358b