buildPythonPackage, buildPythonApplication: support `__structuredAttrs = true` #34955

Job	Run time
get-merge-commit / resolve-merge-commit	4s
Attributes	1m 11s
Eval nixpkgs with aliases enabled	44s
Outpaths (aarch64-linux)	4m 0s
Outpaths (aarch64-darwin)	3m 46s
Outpaths (x86_64-linux)	4m 18s
Outpaths (x86_64-darwin)	3m 37s
Process	57s
Tag	0s
	18m 37s

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