editoast: refactor infra tests part 6

[hamz2a]

Part of https://github.com/OpenRailAssociation/osrd/issues/6980

[codecov-commenter]

Codecov Report

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

Project coverage is 28.68%. Comparing base (24485e2) to head (805f5f4). Report is 5 commits behind head on dev.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #7839 +/- ## ============================================ + Coverage 28.64% 28.68% +0.03% Complexity 2058 2058 ============================================ Files 1247 1249 +2 Lines 154277 154409 +132 Branches 3029 3040 +11 ============================================ + Hits 44199 44295 +96 - Misses 108277 108301 +24 - Partials 1801 1813 +12 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [core](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `75.01% <ø> (ø)` | | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `72.00% <100.00%> (+0.15%)` | :arrow_up: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `10.01% <ø> (+<0.01%)` | :arrow_up: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `2.41% <ø> (ø)` | | | [railjson_generator](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `87.49% <ø> (ø)` | | | [tests](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7839/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `72.93% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#carryforward-flags-in-the-pull-request-comment) to find out more.

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