Simplify flatteining and inlining of Coreschema #10258

Job	Run time
lint 3.7	1m 19s
lint 3.8	1m 33s
docs-build	2m 23s
lint 3.9	1m 10s
test memray	5m 28s
test ubuntu / 3.7	2m 9s
lint 3.10	1m 31s
test ubuntu / 3.8	2m 17s
lint 3.11	1m 8s
test fastapi	2m 7s
test ubuntu / 3.9	2m 15s
test ubuntu / 3.10	2m 11s
mypy 1.0.1 / 3.10	7m 27s
test ubuntu / 3.11	2m 42s
test macos / 3.7	3m 27s
mypy lockfile / 3.10	4m 19s
test typing-extensions 4.6.1 on Python 3.8	2m 26s
test macos / 3.8	3m 25s
mypy 1.2.0 / 3.10	5m 26s
test macos / 3.9	3m 23s
test typing-extensions 4.6.1 on Python 3.9	3m 4s
mypy 1.4.1 / 3.10	3m 5s
test macos / 3.10	3m 28s
test typing-extensions 4.6.1 on Python 3.10	3m 20s
mypy 1.5.1 / 3.10	3m 47s
test macos / 3.11	3m 55s
test typing-extensions 4.6.1 on Python 3.11	2m 38s
mypy lockfile / 3.7	5m 3s
test windows / 3.7	2m 48s
test typing-extensions main on Python 3.8	2m 51s
mypy lockfile / 3.8	4m 52s
test windows / 3.8	4m 20s
mypy lockfile / 3.9	6m 4s
test typing-extensions main on Python 3.9	2m 43s
test windows / 3.9	3m 32s
mypy lockfile / 3.11	4m 51s
test windows / 3.10	4m 48s
test typing-extensions main on Python 3.10	3m 27s
test windows / 3.11	4m 21s
test typing-extensions main on Python 3.11	2m 42s
test ubuntu / pypy3.7	9m 39s
test typing-extensions 4.6.1 on Python 3.7	1m 46s
test ubuntu / pypy3.8	7m 27s
test ubuntu / pypy3.9	8m 57s
coverage-combine	28s
check	4s
release	0s
Send tweet	0s
	2h 42m 6s

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