test: flaky heavy shallow fork triggers migration prune and fcu

[craigmayhew]

Describe the changes
Currently this is a PR of assertions and not a fix.

Debug Notes

• The test occasionally mines a total of 7 blocks, when 6 are expected.
• The test sometimes fails due to a 4th block being seen after testing_peer_with_assignments_and_name() when 3 (the number imn this tests epoch settings) are expected.
  • assert_eq!(base_height, num_blocks_in_epoch as u64);
• The test sometimes fails due to a 5th block at fork_height when 4 are expected
  • assert_eq!(fork_height, canonical_block_level1.height);

Checklist

• Tests have been added/updated for the changes.
• Documentation has been updated for the changes (if applicable).
• The code follows Rust's style guidelines.

Additional Context
Add any other context about the pull request here.

[craigmayhew]

~1% of the time on local runs this error is seen: Error: Timeout: No reorg event received within 20 seconds. It is possible this was/will be fixed by #944

[craigmayhew]

latest test results:

   TRY 2 FAIL [  23.846s] irys-chain::mod multi_node::fork_recovery::slow_heavy_reorg_upto_block_migration_depth
   TRY 2 FAIL [  23.667s] irys-chain::mod multi_node::mempool_tests::slow_heavy_evm_mempool_fork_recovery_test

[craigmayhew]

Locally

$ cargo nextest run --workspace --tests --all-targets --retries=0 heavy_shallow_fork_triggers_migration_prune_and_fcu
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.54s
────────────
 Nextest run ID 0cf100eb-f092-4a76-84f2-74f96a960fbc with nextest profile: default
    Starting 1 test across 45 binaries (1057 tests skipped)
        PASS [  10.874s] irys-chain::mod multi_node::fork_recovery::heavy_shallow_fork_triggers_migration_prune_and_fcu
────────────
     Summary [  10.874s] 1 test run: 1 passed, 1057 skipped
Test passed
----------------------------------------
Reached maximum iterations (500)
All tests passed

[craigmayhew]

On some runs this error is seen Error: Reth latest block did not reach expected hash 0x2fa08d711ca0028f245fac5fbbf181c3220b682255d8e3c818ac2279d6556690 within 20s

I today am not seeing this and am now also not seeing this locally.

[craigmayhew]

TRY 2 FAIL [   6.216s] irys-chain::mod multi_node::fork_recovery::slow_heavy_reorg_upto_block_migration_depth

[craigmayhew]

CI FAIL from slow_heavy_promotion_with_multiple_proofs_test

[craigmayhew]

slow_heavy_promotion_with_multiple_proofs_test - this failure was fixed in #944