front: reference map when no infra (or not existing) is selected

[sim51]

Fix #6541

• map layers : don't display them if the infra is undefined (avoid 404)
• InfraSelector : remove the code that check that the current infra exist (not it's role and if the infra doesn't exist display an error toast)
• map reference: if the current infra doesn't exist, then we set it as undefined in the state. It avoid to have "no selected infra" in the header whereas in reality we have one in the store

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 110 lines in your changes missing coverage. Please review.

Project coverage is 28.53%. Comparing base (e79e415) to head (00e7b2c). Report is 2 commits behind head on dev.

Files	Patch %	Lines
...ront/src/common/Map/Layers/extensions/SNCF/PSL.tsx	0.00%	27 Missing :warning:
front/src/common/Map/Layers/SpeedLimits.tsx	0.00%	24 Missing :warning:
front/src/common/Map/Layers/Electrifications.tsx	0.00%	21 Missing :warning:
front/src/applications/referenceMap/Home.tsx	0.00%	11 Missing :warning:
...s/infra/components/InfraSelector/InfraSelector.tsx	0.00%	3 Missing and 1 partial :warning:
front/src/common/Map/Layers/LineSearchLayer.tsx	0.00%	3 Missing :warning:
front/src/common/Map/Layers/TracksGeographic.tsx	0.00%	3 Missing :warning:
front/src/common/Map/Layers/BufferStops.tsx	0.00%	2 Missing :warning:
front/src/common/Map/Layers/Detectors.tsx	0.00%	2 Missing :warning:
front/src/common/Map/Layers/OperationalPoints.tsx	0.00%	2 Missing :warning:
... and 6 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #7897 +/- ## ============================================ - Coverage 28.54% 28.53% -0.02% Complexity 2059 2059 ============================================ Files 1249 1249 Lines 154210 154166 -44 Branches 3036 3036 ============================================ - Hits 44024 43990 -34 + Misses 108376 108366 -10 Partials 1810 1810 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7897/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/7897/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `74.95% <ø> (ø)` | | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7897/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `71.62% <ø> (-0.05%)` | :arrow_down: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7897/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `10.00% <0.00%> (-0.01%)` | :arrow_down: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7897/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `2.34% <ø> (ø)` | | | [railjson_generator](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7897/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/7897/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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