fix: validation of JSON to be imported

[lechnerc77]

Purpose

• Validate JSON file content before executing import
• closes #146

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Test the code via automated test

make test

• Additional test steps

Import a JSON with invlaid resource names

What to Check

Verify that the following are valid:

• Automated tests are executed successfully
• An erro is raised

Other Information

n/a

Checklist for reviewer

The following organizational tasks must be completed before merging this PR:

• [X] The PR is assigned to the Project board and a status is set (typically "in review").
• [X] The PR has the matching labels assigned to it.
• [X] The PR has a milestone assigned to it.
• [X] If the PR closes an issue, the issue is referenced.
• [X] Possible follow-up issues are created and linked.