Calculation Setup deletion dialogues

[mrvisscher]

User is presented with a warning dialogue when deleting a calculation setup now. A confirmation dialogue is shown when the deletion succeeds. Closes #1186

Checklist

• [x] Keep pull requests small so they can be easily reviewed.
• [x] Update the documentation, please follow the numpy style guide.
• [x] Update tests.
• [x] Categorize the PR by setting a good title and adding one of the labels: bug, feature, ui, change, documentation, breaking, ci as they show up in the changelog.
• [x] Link this PR to related issues by using closing keywords.
• [x] Request a review from another developer.

[coveralls]

coverage: 50.963% (+0.3%) from 50.634% when pulling 7a7ab365416a486522f0dea935917eda1c8d8e6e on mrvisscher:cs-deletion-dialogue into 58a3f054ac8f3f2dd0362abfcb3dee472f7dfa51 on LCA-ActivityBrowser:master.

[github-actions[bot]]

[!NOTE] This issue has been implemented in the new release of Activity Browser 🚀 (version 2.9.4), you can get the new version by updating Activity Browser.

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