[core] Revert strict mode compatible transition components

[eps1lon]

Reverts #16283 which was a breaking change for Snackbar with custom children i.e. not components from @material-ui/*.

Closes #16347

[mui-pr-bot]

@material-ui/core: parsed: -0.15% 😍, gzip: -0.11% 😍

Details of bundle changes.

Comparing: 0bee9a7...985ca67

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	-0.15%	-0.11%	320,509	320,016	88,449	88,351
@material-ui/core/Paper	0.00%	0.00%	68,278	68,278	20,363	20,363
@material-ui/core/Paper.esm	0.00%	0.00%	61,573	61,573	19,161	19,161
@material-ui/core/Popper	0.00%	+0.04% 🔺	28,945	28,945	10,391	10,395
@material-ui/core/Textarea	0.00%	-0.08%	5,513	5,513	2,376	2,374
@material-ui/core/TrapFocus	0.00%	0.00%	3,753	3,753	1,578	1,578
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,009	16,009	5,791	5,791
@material-ui/core/useMediaQuery	0.00%	0.00%	2,597	2,597	1,102	1,102
@material-ui/lab	-0.21%	-0.19%	140,344	140,052	43,471	43,387
@material-ui/styles	0.00%	0.00%	51,698	51,698	15,348	15,348
@material-ui/system	0.00%	0.00%	15,420	15,420	4,391	4,391
Button	-0.16%	-0.18%	84,430	84,296	25,758	25,712
Modal	0.00%	+0.02% 🔺	14,427	14,427	5,086	5,087
Portal	0.00%	+0.06% 🔺	3,473	3,473	1,571	1,572
Slider	0.00%	+0.02% 🔺	74,752	74,752	23,240	23,245
colorManipulator	0.00%	0.00%	3,904	3,904	1,544	1,544
docs.landing	0.00%	0.00%	55,119	55,119	13,941	13,941
docs.main	-0.09%	-0.14%	649,042	648,454	204,800	204,506
packages/material-ui/build/umd/material-ui.production.min.js	-0.15%	-0.15%	293,672	293,222	84,362	84,233

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