Revert "Fix Literal strings containing pipe characters" #13020

Job	Run time
Test mypyc suite with 32-bit Python	6m 45s
Test suite with py38-ubuntu, mypyc-compiled	17m 22s
Test suite with py38-windows-64	20m 27s
Test suite with Python nightly	13m 31s
Test suite with py39-ubuntu	16m 30s
Test suite with py310-ubuntu	15m 46s
Test suite with py311-ubuntu, mypyc-compiled	15m 32s
Test suite with py312-ubuntu, mypyc-compiled	17m 52s
mypyc runtime tests with py39-macos	5m 18s
mypyc runtime tests with py38-debug-build-ubuntu	4m 24s
Type check our own code (py38-ubuntu)	1m 46s
Type check our own code (py38-windows-64)	2m 6s
Formatting and code style with Black + ruff	38s
	2h 17m 57s

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