Delete nonreduced fuzz inputs

[maflcko]

As per the usual process to avoid wasted CI resources and timeouts when CI runs on large and presumed irrelevant inputs.

Normally, deletion of non-reduced fuzz inputs should happen after feature-freeze on the master Bitcoin Core branch, but before branch-off, so that the latest release branch retains mostly valid fuzz inputs.

Previous: #221

To "reproduce"

Install a fresh VM, as explained in the bash script's doc, and run it:

apt update && apt install curl -y
curl -L -O https://raw.githubusercontent.com/bitcoin-core/bitcoin-maintainer-tools/main/delete_nonreduced_fuzz_inputs.sh
bash delete_nonreduced_fuzz_inputs.sh

To "test"

• Keep an eye on coverage stats, to ensure it doesn't drop
• Re-run the script, to ensure it is "reproducible" to some extent
• Anything else you think is important to test or review

CI

CI should pass, except for a lint failure, which should light up on any changes like this pull request, which delete fuzz inputs.

[maflcko]

Storage device usage (du -sh ./fuzz_corpora/)

6.2G -> 2.9G

Determinism

• ~145k fuzz input files deleted

git diff origin/main a1a5f2c539622e19185563c8a161bc46106ab66a --stat | tail -1
 145882 files changed, 479508 deletions(-)

• Cross-diff with a second run of the script: 13k fuzz input files

git -c diff.renameLimit=8007 diff --stat HEAD a1a5f2c539622e19185563c8a161bc46106ab66a | tail -1 
 13428 files changed, 1835 insertions(+), 1785 deletions(-)

Coverage

main: https://drahtbot.space/host_reports/DrahtBot/reports/coverage_fuzz/monotree/7e58c94112d061af/8896c4758d4fd066/fuzz.coverage/index.html

this pull: https://drahtbot.space/host_reports/DrahtBot/reports/coverage_fuzz/monotree/7e58c94112d061af/a1a5f2c539622e19/fuzz.coverage/index.html

[dergoegge]

ACK a1a5f2c

Ran the script myself and got the ~same size reduction

[marcofleon]

original coverage: https://marcofleon.github.io/coverage/original_fuzz_corpora/
reduced coverage: https://marcofleon.github.io/coverage/reduced_fuzz_corpora/