Delete `tkinter.{Grid,Pack,Place}.content` #15314

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.13)	37s
stubtest: stdlib (macos-latest, 3.11)	27s
stubtest: stdlib (ubuntu-latest, 3.12)	38s
stubtest: stdlib (windows-latest, 3.11)	2m 41s
stubtest: stdlib (windows-latest, 3.12)	1m 23s
stubtest: stdlib (macos-latest, 3.10)	48s
stubtest: stdlib (ubuntu-latest, 3.15)	1m 3s
stubtest: stdlib (windows-latest, 3.14)	2m 6s
stubtest: stdlib (macos-latest, 3.15)	1m 13s
stubtest: stdlib (macos-latest, 3.14)	1m 1s
stubtest: stdlib (windows-latest, 3.13)	1m 17s
stubtest: stdlib (macos-latest, 3.13)	32s
stubtest: stdlib (ubuntu-latest, 3.11)	42s
stubtest: stdlib (macos-latest, 3.12)	45s
stubtest: stdlib (windows-latest, 3.15)	2m 15s
stubtest: stdlib (ubuntu-latest, 3.10)	37s
stubtest: stdlib (ubuntu-latest, 3.14)	37s
	18m 42s

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