[backport#17069] tests: Pass fuzzing inputs as constant references
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Description

[backport#17069] tests: Pass fuzzing inputs as constant references

Summary:
ffa22212560c9e7a8692cb8982d9b3b507ee9af1 tests: Pass fuzzing inputs as constant references (practicalswift)

Pull request description:

Pass fuzzing inputs as constant references.

Split out from #17009 as suggested by MarcoFalke in https://github.com/bitcoin/bitcoin/pull/17009#discussion_r331502028.

Backport of Core PR17069

Test Plan:

export CC=clang CXX=clang++
../configure --enable-fuzz --with-sanitizers=fuzzer,address \
  --disable-wallet \
  --disable-bench \
  --with-utils=no \
  --with-daemon=no \
  --with-libs=no \
  --with-gui=no \
  --with-seeder=no
make
mkdir -p test/fuzz
cp ../test/fuzz/test_runner.py test/fuzz/
./test/fuzz/test_runner.py -l DEBUG <path_to_corpus>

cmake -GNinja .. -DENABLE_SANITIZERS="address;fuzzer" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
ninja bitcoin-fuzzers link-fuzz-test_runner.py
./test/fuzz/test_runner.py -l DEBUG <path_to_corpus>

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D6740