AlgebraicGeometry: added graph_curve(::Graph) #18162

Job	Run time
extra-long-test	0s
doctest (1.10, Linux, RPTU, normal-memory)	22m 52s
doctest (1.11, Linux, RPTU, normal-memory)	21m 38s
test (1.6, short, Linux)	20m 5s
doctest (nightly, Linux, RPTU, normal-memory)	26m 8s
test (1.6, long, Linux)	17m 17s
doctest (1.10, Linux, RPTU, normal-memory, depwarn=error)	26m 24s
test (1.10, short, Linux)	19m 2s
doctest (1.10, macOS, RPTU)	15m 26s
test (1.10, long, Linux)	17m 28s
test (1.11, short, Linux)	19m 23s
test (1.11, long, Linux)	15m 47s
test (nightly, short, Linux)	2h 30m 10s
test (nightly, long, Linux)	37m 29s
test (1.10, short, Linux, RPTU, high-memory, depwarn=error)	18m 55s
test (1.10, long, Linux, RPTU, normal-memory, depwarn=error)	16m 57s
test (1.10, short, macOS, RPTU)	14m 30s
test (1.10, long, macOS, RPTU)	13m 3s
test (1.10, book, Linux, RPTU, normal-memory)	49m 39s
test (nightly, book, Linux, RPTU, normal-memory)	40m 32s
	9h 22m 45s

Provide feedback