[Tests] better code quality in TH2M py notebooks

• replaced vtuIO with ogstools
• added assertions
• reduced repetitions

added ciweb only label

assigned to @FZill

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• eb5d1a32 - [Tests] better code quality in TH2M py notebooks

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added workflowplease review label

requested review from @felikskiszkurno, @TobiasMeisel, and @Scinopode

mentioned in issue #3513

Code changes look reasonable; didn't look at the output. The two minuscule comments from my side can be ignored.

approved this merge request

mentioned in merge request ogs/tools/ogstools!233 (closed)

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• ee0fb4b4 - [Tests] better code quality in TH2M py notebooks

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reset approvals from @endJunction by pushing to the branch

mentioned in issue #3522