Rename EraSegWits to EraBlockBody and TxSeq to BlockBody #19015

Job	Run time
Check if formal-ledger-specifications SRP is valid	13s
fourmolu	43s
shellcheck	5s
build (9.10.2, ubuntu-latest)	4m 41s
build (9.8.4, ubuntu-latest)	4m 28s
cabal-format	6s
gen-hie	4m 40s
build (9.12.2, ubuntu-latest)	4m 42s
build (9.6.7, ubuntu-latest)	4m 42s
Check branch history	12s
codegen	1s
${{ matrix.package }}-${{ matrix.ghc }}-${{ matrix.os }}	1s
Tests completed	3s
Send a slack notification on \#ledger-internal if the nightly build failed	1s
	24m 38s

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