REPLExt: run repl hint generation for modeswitch chars when not switc… #4154

Job	Run time
docs	3m 57s
test (ubuntu-latest, x64, pkg.julialang.org, nightly)	17m 54s
test (ubuntu-latest, x86, pkg.julialang.org, nightly)	23m 26s
test (macOS-14, aarch64, pkg.julialang.org, nightly)	14m 51s
test (windows-latest, x64, pkg.julialang.org, nightly)	36m 5s
test (windows-latest, x86, pkg.julialang.org, nightly)	38m 23s
test (ubuntu-latest, x64, nightly)	21m 24s
	2h 36m 0s

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