[split] Main changes — from #21

[pull-apart]

Automated split from #21.

Context

This is the main / behavior half of an automated split from #21.

Changes in this PR:

• utilities/unittests/test_console.py: Added extensive new unit tests for the _spawn_console method, covering success and various failure scenarios (Popen failure, fdspawn failure with process termination outcomes).
• Added extensive new unit tests for the _terminate_proc method, testing scenarios like no process, process already exited, and a running process with graceful termination or forced kill.
• Added new unit tests for the connect method's error handling, verifying _terminate_proc is called on TimeoutExpiredError or pexpect exceptions.
• Updated test_console_disconnect_terminated_child to align with the new _proc attribute and console_eof_sampler changes.
• Updated test_console_eof_sampler_success and test_console_eof_sampler_no_sample to reflect _spawn_console as the internal retry function.
• Introduced _single_attempt_sampler helper function for mocking TimeoutSampler behavior in tests.
• Added pytest import for new test cases.

How this split maps your changes

• Refactor branch (split-pr-21-1783401787-refactor): files classified as cleanup / mechanical work:
  • utilities/console.py
• Main branch (split-pr-21-1783401787-main): files classified as feature / behavior work:
  • utilities/unittests/test_console.py

Merge order

Merge the refactor PR first if it touches shared files or would conflict with the main PR; then merge the main PR. Resolve conflicts in the usual way if both branches touch the same lines.

Refactor PR: #33

[RoniKishner]

@pull-apart /close