fix: Use T4C repository in multiple projects / models

[MoritzWeber0]

When a single T4C repository was used in multiple different toolmodels, the repository was injected twice into the session in the T4C session hook.

This led to errors in the dropdown menu of the T4C connection in Capella sessions.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

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

Project coverage is 84.04%. Comparing base (6b57058) to head (16ff290). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1772 +/- ## ======================================= Coverage 84.04% 84.04% ======================================= Files 186 186 Lines 6137 6137 Branches 675 675 ======================================= Hits 5158 5158 Misses 831 831 Partials 148 148 ```

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