Resolve "Resolve issues with deleting an edition"

What does this MR do (summary)?

Make sure role's get removed for a deleted session in order to prevent other applications from trying to access them whilst accessing the roles entries.

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What changes have you made (detailed)?

Does this MR meet the acceptance criteria?

• The main application was run to make sure the server still runs without errors.
• Tests were written to verify the behaviour of this code.
• Javadoc and other comments were added to make the code understandable.
• The code adheres to the style guidelines.

Closes #145 (closed)

added priohigh statusconfirmed typebug labels

assigned to @cedricwilleken

added 1 commit

• 3063c2a5 - Make sure the roles entry for a deleted edition get removed

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marked this merge request as ready

changed the description

added 1 commit

• b5ccaaba - Make sure the roles entry for a deleted edition get removed

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requested review from @otto

added 39 commits

• b5ccaaba...b127d77d - 38 commits from branch development
• 43b0d983 - Merge branch 'development' into '145-resolve-issues-with-deleting-an-edition'

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approved this merge request

started a merge train

merged

mentioned in commit 8579a4e9

unassigned @cedricwilleken