Improve check of expected shell commands in check/format-incremental

[pavoljuhas]

Set the CI environment variable to get the --color option unconditionally.
Also check if isort is invoked.

Follow-up to #7181

[pavoljuhas]

This fixes the pytest failure due to a missing --color option when run locally -

$ pytest dev_tools/bash_scripts_test.py

FAILED dev_tools/bash_scripts_test.py::test_incremental_format_branch_selection - assert 'INTERCEPTED black --color --check --diff alt.py' in 'Sorting imports with isort... (version: 6.0....

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.14%. Comparing base (0f652e1) to head (5c68ac4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7196      +/-   ##
==========================================
- Coverage   98.14%   98.14%   -0.01%     
==========================================
  Files        1100     1100              
  Lines       96191    96192       +1     
==========================================
- Hits        94409    94408       -1     
- Misses       1782     1784       +2     

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[mhucka]

LGTM