[test-triage] `flash_ctrl_error_prog_type` flakey

### Hierarchy of regression failure

Block level

### Failure Description

`flash_ctrl_error_prog_type` has been partly timing-out regularly since around 21st August 2024 ([34b8fc33e3](https://github.com/lowrisc/opentitan/tree/34b8fc33e36b3ed2a32e6cd50b451a47f16b202d)).

e.g.:
```
Job timed out after 60 minutes
```

### Steps to Reproduce

- GitHub Revision: 25b1acbf68
- dvsim invocation command to reproduce the failure, inclusive of build and run seeds:
`util/dvsim/dvsim.py hw/ip_templates/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson -i flash_ctrl_error_prog_type --build-seed 115096073277204595231937901342804627564470767004707790242822318429579153097636 --seed 102494197276331117854647828649867813498500803795535853914362770085625559508697`

### Tests with similar or related failures

Also mentioned in https://github.com/lowRISC/opentitan/issues/24425

Start with hw/ip_templates/flash_ctrl/dv/flash_ctrl_sim_cfg.hjson and the flash_ctrl_error_prog_type test. Run the supplied dvsim invocation at revision 25b1acbf68 with its build and run seeds, then compare the timeout with the related failures in issue #24425. Done means the recurring 60-minute timeout is explained and the test completes reliably.

Written by the indexing model from the issue text.