Refactor item e2e tests #347

[joelvdavies]

Description

See #347.

Notes

• test_create_with_missing_existing_properties -> test_create_with_some_properties_provided
• Added test_create_with_invalid_string_allowed_values_list_type and similar for number/update tests (to match catalogue items)

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• [ ] Review code
• [ ] Check Actions build
• [ ] Review changes to test coverage

Agile board tracking

Closes #347

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.86%. Comparing base (6adc501) to head (8c2c069). Report is 16 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #359 +/- ## ======================================== Coverage 97.86% 97.86% ======================================== Files 41 41 Lines 1502 1502 ======================================== Hits 1470 1470 Misses 32 32 ```

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