[C++][Parquet][CI] Seed corpus should also use bad data files

[pitrou]

Describe the enhancement requested

Currently our Parquet fuzzing seed corpus consists entirely of testing data files, see here:

arrow/cpp/build-support/fuzzing/generate_corpuses.sh

Lines 57 to 58 in ab432b1

	# Add Parquet testing examples
	cp ${ARROW_CPP}/submodules/parquet-testing/data/*.parquet ${CORPUS_DIR}

We should also add files from the bad_data directory in the testing repository.

Component(s)

C++, Continuous Integration, Parquet

[pitrou]

@mapleFU Would you like to take a look?

[mapleFU]

I'd like adding this tonight when I back home

[pitrou]

Issue resolved by pull request 43708
#43708