buildPythonPackage, buildPythonApplication: support `__structuredAttrs = true` #22653

Job	Run time
get-merge-commit / resolve-merge-commit	3s
Attributes	1m 13s
Eval nixpkgs with aliases enabled	37s
Outpaths (aarch64-linux)	3m 50s
Outpaths (aarch64-darwin)	3m 29s
Outpaths (x86_64-linux)	4m 2s
Outpaths (x86_64-darwin)	3m 35s
Process	54s
Tag	0s
	17m 43s

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