install: support grub2/30_console.cfg for console replacement #2395

Job	Run time
Docs	2m 16s
Lints, pinned toolchain (x86_64)	1m 17s
Lints, pinned toolchain (s390x)	9m 23s
Tests, minimum supported toolchain (x86_64)	2m 28s
Tests, unstable toolchain (beta, x86_64)	2m 20s
Tests, minimum supported toolchain (s390x)	13m 26s
Tests, unstable toolchain (nightly, x86_64)	2m 8s
Tests, stable toolchain (x86_64)	2m 12s
Tests, stable toolchain (s390x)	13m 2s
	48m 32s

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