Fix issues flagged by Ruff

Running the linter Ruff with the default settings flags a number of issues, which are fixed in this PR.

Mostly unused imports/variables and many single line if-statements, which are generally considered (also by me ) to be difficult to read.

requested review from @cribe001

assigned to @ceesvoesenek

marked this merge request as draft

added 2 commits

• c7d6b749 - Restore not-so-unused imports removed by Ruff
• 0f3fa102 - Skip batch processing test for which we have no data in the repository

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marked this merge request as ready

approved this merge request

mentioned in commit 7043e53f

merged