ParallelProverService: Add integration tests.

[bkolad]

Description

This PR includes the following changes:

1. Adds handling for the ProofProcessingStatus::Busy status
2. Extends the MockZkvm with functionality to simulate a slow proving process, effectively halting the current worker thread.
3. Adds unit tests for the ParallelProverService.

See #1185 regarding future work.

Linked Issues

• Related to Integrate the ProverService with the ForkManager #1185

Testing

Adds new integration tests for the. ParallelProverService.

[codecov]

Codecov Report

Merging #1175 (d45392b) into nightly (1307350) will increase coverage by 1.4%.
Report is 1 commits behind head on nightly.
The diff coverage is 97.1%.

Additional details and impacted files

Files	Coverage Δ
adapters/mock-da/src/types/mod.rs	80.6% <100.0%> (+7.5%)	⬆️
full-node/db/sov-db/src/schema/tables.rs	86.4% <ø> (ø)
full-node/db/sov-schema-db/src/lib.rs	92.2% <100.0%> (-0.5%)	⬇️
...sov-prover-storage-manager/src/snapshot_manager.rs	100.0% <100.0%> (ø)
full-node/sov-stf-runner/src/prover_service/mod.rs	100.0% <100.0%> (+100.0%)	⬆️
.../sov-stf-runner/src/prover_service/parallel/mod.rs	95.4% <100.0%> (+1.5%)	⬆️
rollup-interface/src/state_machine/da.rs	84.7% <ø> (ø)
adapters/avail/src/spec/hash.rs	0.0% <0.0%> (ø)
adapters/mock-zkvm/src/lib.rs	77.3% <95.8%> (+5.6%)	⬆️
full-node/sov-stf-runner/src/runner.rs	78.9% <71.4%> (-0.3%)	⬇️
... and 4 more

... and 1 file with indirect coverage changes