graphman: disable load management when using graphman #9549

Job	Run time
Subgraph Runner integration tests	3m 34s
Subgraph Runner integration tests	7m 38s
Clippy linting	1m 4s
Clippy linting	1m 4s
Build in release mode	1m 17s
Build in release mode	1m 17s
Run integration tests	5m 23s
Run integration tests	5m 23s
Check rustfmt style	6s
Check rustfmt style	6s
Run unit tests	9m 45s
Run unit tests	9m 45s
	46m 22s

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