Deprecate conda.testing.integration.make_temp_env in favor of conda.testing.tmp_env

[kenodegard]

Description

Continuation of #12592

Straightforward substitutions:

• tests/cli/test_main_clean.py
• tests/cli/test_main_list.py
• tests/gateways/test_connection.py
• tests/plugins/subcommands/doctor/test_cli.py
• tests/test_activate.py
• tests/test_misc.py
• tests/test_cli.py

Removed unused temporary environment:

• tests/core/test_subdir_data.py
• tests/plugins/subcommands/doctor/test_health_checks.py

Refactored into pytest-style:

• tests/test_export.py
• tests/test_priority.py

Significant refactor:

• tests/test_create.py
  • this required a lot of work
  • get tests to run successfully on osx-arm64 (will be valuable when M1 macOS runners become available)

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• Add / update outdated documentation?

[kenodegard]

stale, this is being accomplished piecemeal elsewhere