Integration Test header_timestamp_value_assertion_in_new_extended_mining_job is not deterministic

[plebhash]

I witnessed header_timestamp_value_assertion_in_new_extended_mining_job failing on CI and locally.

Re-running it makes it work.

Here's a failed CI run: https://github.com/stratum-mining/stratum/actions/runs/12897499112/job/35962754080?pr=1340

[plebhash]

here's logs from a local run on macOS:

cargo t
   Compiling integration_tests_sv2 v0.1.0 (/Users/plebhash/develop/stratum/roles/tests-integration)
    Finished test [optimized + debuginfo] target(s) in 1.95s
     Running unittests lib/mod.rs (/Users/plebhash/develop/stratum/roles/target/debug/deps/integration_tests_sv2-e723a8dcb1cce55d)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running tests/pool_integration.rs (/Users/plebhash/develop/stratum/roles/target/debug/deps/pool_integration-429d0bab5ae8b192)

running 2 tests
test header_timestamp_value_assertion_in_new_extended_mining_job ... FAILED
test success_pool_template_provider_connection ... ok

failures:

---- header_timestamp_value_assertion_in_new_extended_mining_job stdout ----
thread 'header_timestamp_value_assertion_in_new_extended_mining_job' panicked at tests-integration/lib/template_provider.rs:132:61:
called `Result::unwrap()` on an `Err` value: Error while executing "/Users/plebhash/develop/stratum/roles/tests-integration/template-provider/bitcoin-sv2-tp-0.1.13/bin/bitcoind"

Caused by:
    Permission denied (os error 13)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    header_timestamp_value_assertion_in_new_extended_mining_job

test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 11.88s

error: test failed, to rerun pass `--test pool_integration`

this was after merging #1359, which means the issue originally reported on #1278 seems to be repeating?

VERY puzzling 🤷🏼

[plebhash]

also very hard to reproduce locally... happened once and never again, even after re-running multiple times (also after removing template-provider)

[plebhash]

closing in favor of re-opening #1278