Bug/12043 uploading a data model with invalid name shows wrong error messages

[JamalAlabdullah]

Description

• Added validation to prevent uploading data model with invalide name.
• Show error message in toast to inform the user about that.
• Added test.

Related Issue(s)

• 12043

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [x] Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• [ ] User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov[bot]]

Codecov Report

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

Project coverage is 91.04%. Comparing base (a5d9253) to head (5e0e354).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12886 +/- ## ======================================= Coverage 91.04% 91.04% ======================================= Files 1385 1385 Lines 19686 19691 +5 Branches 2387 2388 +1 ======================================= + Hits 17923 17928 +5 Misses 1501 1501 Partials 262 262 ```

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