Tests: Fix get_or_merge_testing_config for cli tests

[mbargull]

Description

cli.main_build.execute (et al.) call the function with **args.__dict__ with args having default values (e.g., croot=None) via parse_args.

Follow-up to gh-5068.
See #5066 (comment)

Checklist - did you ...

• Add a file to the news directory (using the template) for the next release's release notes?
• Add / update necessary tests?
• Add / update outdated documentation?

[mbargull]

pre-commit.ci autofix

[mbargull]

pre-commit.ci autofix

[mbargull]

I took the opportunity to let this run multiple times (on Sunday so I don't cause large CI queues for others).
Overall, things look quite better than before but there are still some failures occasionally:

1. macos (3.8, release, parallel)

FAILED tests/test_variants.py::test_build_run_exports_act_on_host - conda.exceptions.PackagesNotFoundError: The following packages are not available from current channels:

  - openssl
  - vc=9*

Current channels:

  - file:///Users/runner/work/_temp/parallel/popen-gw0/test_build_run_exports_act_on_0/win-32

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org/

and use the search bar at the top of the page.

2. linux (3.11, canary, serial)

FAILED tests/cli/test_main_build.py::test_build_add_channel - KeyError: PackageRecord(_hash=3447543960105723200, name='conda_build_test_requirement', version='1.0', build='h35b8010_0', build_number=0, channel=Channel("conda_build_test/linux-64"), subdir='linux-64', fn='conda_build_test_requirement-1.0-h35b8010_0.tar.bz2', md5='b643e7c94252b812aaff56ca1c83f002', url='https://conda.anaconda.org/conda_build_test/linux-64/conda_build_test_requirement-1.0-h35b8010_0.tar.bz2', arch='x86_64', platform='linux', depends=(), timestamp=1497374008.185, size=1978)

3. linux (3.11, canary, parallel)

FAILED tests/cli/test_main_build.py::test_test_extra_dep - KeyError: PackageRecord(_hash=-5768541241801201921, name='test_test_extra_dep', version='1.0', build='1', build_number=1, channel=Channel("test_test_extra_dep0/linux-64"), subdir='linux-64', fn='test_test_extra_dep-1.0-1.tar.bz2', md5='2001052b4eac59e5e1c5808642dcf21a', url='file:///home/runner/work/_temp/parallel/popen-gw1/test_test_extra_dep0/linux-64/test_test_extra_dep-1.0-1.tar.bz2', sha256='22f404ef55a1a1c360402893d07cd136846a7012ee7fed0daad9fcf24524d89d', arch=None, platform=None, depends=(), license='contract in blood', timestamp=1700406669.469, size=3037)

---

Note:

• All of these are sporadic failures and thus could be difficult to reproduce locally.
• Ignore the serial/parallel test distinction for now; serial marked tests are actually run in parallel currently.
• There could be interactions with conda-libmamba-solver, but (esp. for 2. and 3.) it is likely caused by package (index) cache corruptions (the tests re-use the same croot/pkgs-dirs and will occasionally trample on each other).

Re. 1: "Current channels" shows .../win-32 which is odd because the test uses platform="win", arch="64".
Re. 2: This is for the non-local https://anaconda.org/conda_build_test/conda_build_test_requirement/files .
Re. 3: This is for the local test_test_extra_dep which is in the correct Channel("test_test_extra_dep0/linux-64").

[mbargull]

I've opened gh-5078 for the general notes on serial tests and collisions in the package cache.