[Bugfix] Fix inadvertently persistent test artifacts

[kdmukai]

Description

• test_flows_seed.py had two instances where Settings.HOSTNAME was being overridden in a way that affected the remainder of the test suite. Neither case was even necessary for the test and so was removed.

• test_flows_view.py another unnecessarySettings.HOSTNAME override.

• test_settings_definition.py: os.walk was unintentionally being permanently mocked out for the remainder of the pytest run, creating confusing side effects in an unrelated test. Changed to a patch.

---

This pull request is categorized as a:

• Bug fix

Checklist

• I’ve run pytest and made sure all unit tests pass before submitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• N/A

I have tested this PR on the following platforms/os:

• Other: Only applies when running the test suite in local dev or CI

[alvroble]

ACK tested

[securesigner]

Ran pytest on modified files and executed full test suite run_full_coverage.sh. All 140 tests passed