due to circular imports issues and me going out of my way to make it work 'cleanly', the previous backwards compatibility for FrappeTestCase unfortunately did not work on the manual cli test runner 'run-tests'
While not generally not affecting CI (which is precedented by the framwork's best practices to use 'run-parallel-test'), this broke some manual developer workflows
The restauration of FrappeTestCase in these scenario now unfortunately involves a plain copy of almost an entire implementation into the dumpster.
On the one hand, this doesn not accurately reflect the rather minuscule differences between IntegrationTestCase and FrappeTestCase, but on the other hand, it shields and freezes the old api should IntegrationTestCase evolve futher
* refactor: prefer staticmethod decorator
* refactor: add cm register utility and keep cms in one file
* refactor: enter safe_exec enabled context (treewide)
* refactor: move trace fields to the other test context managers
* chore: marke all test_runner functions for deprecation
* chore: mark some tests.utils functions for deprecation (moved)
* chore: mark traced_field_conext for deprecation (moved)
* chore: placate semgrep in dumpster
* fix: show deprecation warnings per module in tests (incl. from dumpster)
* chore: remove use of deprecated functions from tests
