Rename ambiguous variable names

[johannaengland]

Another step in preparation of adding more ruff rules. This is for E741 - Ambiguous variable name

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	992		0	11.18s
✅ PYTHON	ruff	987		0	0.08s

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[github-actions]

Test results

    9 files      9 suites   8m 27s ⏱️
2 128 tests 2 128 ✅ 0 💤 0 ❌
3 995 runs  3 995 ✅ 0 💤 0 ❌

Results for commit ee956e9.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.47%. Comparing base (5d6feef) to head (ee956e9).
Report is 429 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3043   +/-   ##
=======================================
  Coverage   60.47%   60.47%           
=======================================
  Files         605      605           
  Lines       43816    43816           
  Branches       48       48           
=======================================
  Hits        26497    26497           
  Misses      17307    17307           
  Partials       12       12           

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