front: localize pathfinding errors

[emersion]

The list of pathfinding error codes can be found here:

https://github.com/OpenRailAssociation/osrd/blob/9f12cd44573cdb498155484cf8ac42372b06a622/core/src/main/kotlin/fr/sncf/osrd/api/api_v2/pathfinding/PathfindingBlockResponse.kt#L84

Closes: https://github.com/OpenRailAssociation/osrd/issues/7862

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 28.32%. Comparing base (4698a66) to head (9bbb973).

Files	Patch %	Lines
...ont/src/modules/pathfinding/hook/usePathfinding.ts	0.00%	4 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #7883 +/- ## ============================================ - Coverage 28.33% 28.32% -0.01% Complexity 2059 2059 ============================================ Files 1270 1270 Lines 155548 155551 +3 Branches 3056 3056 ============================================ - Hits 44071 44058 -13 - Misses 109652 109668 +16 Partials 1825 1825 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7883/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/7883/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `74.98% <ø> (ø)` | | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7883/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `71.23% <ø> (-0.05%)` | :arrow_down: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7883/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `9.95% <0.00%> (-0.01%)` | :arrow_down: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7883/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/7883/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/7883/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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[emersion]

From my understanding after Eloi explained me this stuff, here's the meaning of each error:

• not_found_in_blocks: could find a path of tracks from origin to destination, but could not find a chain of blocks from origin to destination (tracks are not directional, blocks are)
• not_found_in_routes: could find a chain of blocks from origin to destination, but at some point we're missing a route in a junction
• not_found_in_tracks: could not find a path of tracks at all (origin and destination are not connected)
• not_enough_path_items: missing origin/destination
• pathfinding_failed: generic error

[emersion]

Trivial rebase against the dev branch.