[graph diff] pipe through to graphql layer

[jamiedemaria]

Summary & Motivation

How I Tested These Changes

[jamiedemaria]

Current dependencies on/for this PR:

• [graph diff] get the parent deployment graph #19708
• [graph diff] pipe through to graphql layer #19719 👈
• [graph diffing] Larger test suite - FOU-22 #19682
• [graph diffing] Class for computing diff between parent and branch asset graphs- FOU-22 #19681 : 2 other dependent PRs (#19811 , #19812 )
• master

This stack of pull requests is managed by Graphite.

[jamiedemaria]

other path in the stack is cleaner