Re-enable the Fuzz workflow (disabled_manually) with two changes that
address the congestion that likely caused it to be disabled:
- Narrow the PR trigger paths to fuzz/**, scripts/fuzz/** and
fuzz.yml only. The broad crate paths (crates/ecstore|filemeta|utils)
queued a ~45min fuzz-build on nearly every PR; coverage of those
crates moves to the nightly schedule, which fuzzes against main.
- Expand the smoke matrix, nightly matrix, run.sh default set and the
fuzz-build staging/upload steps from 3 to all 5 buildable targets:
archive_extract, bucket_validation, local_metadata, path_containment,
policy_ingress. archive_extract and policy_ingress were previously
in no matrix.
The two *_storage_api.rs files are `mod` submodules of their parent
targets (bucket_validation, path_containment), not standalone bins, so
fuzz/Cargo.toml registers exactly 5 fuzz bins.
Smoke jobs run one target per parallel matrix job (-max_total_time=60),
so wall-clock stays per-target, well under the 15min budget for a
fuzz-only PR. A TODO(ci-8) hook marks where scheduled-failure alerting
will attach on the nightly job.
Refs rustfs/backlog#1149 (ci-9, absorbed sec-13), rustfs/backlog#1155
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