fix: handle RouteHandle::submit returning SubmitOutcome

[peshence]

Summary

Adapt to bits crate API change where RouteHandle::submit now returns SubmitOutcome instead of bare JobHandle, enforcing broker-wide max_jobs admission control on all submission paths.

Changes

• frontend/src/api/v2.rs — match on SubmitOutcome, return HTTP 529 with {"error": ..., "retryable": true} on Overloaded
• frontend/src/api/v1.rs — match on SubmitOutcome, return HTTP 529 with {"status": "failed", "message": ..., "retryable": true} on Overloaded
• frontend/src/lib.rs — EDR collection path matches SubmitOutcome, returns Err(SubmitError::Upstream(...)) on Overloaded
• frontend/Cargo.toml — bits dependency updated to rev = 9eb29779
• Imports — added SubmitOutcome to use bits::{...} in v1 and v2 modules

Depends on

• bits-broker: https://github.com/ecmwf/bits-broker/pull/49

Tested

• cargo check ✅
• cargo test -p polytope-server ✅ (183 tests pass)
• Deployed to LUMI dev — health check and test collection submit/retrieve working

[Copilot]

Pull request overview

Updates the polytope-server frontend to accommodate a bits API change where RouteHandle::submit now returns a SubmitOutcome (enabling broker-wide admission control via max_jobs) and maps Overloaded outcomes into consistent HTTP/API-level overload responses.

Changes:

• Handle SubmitOutcome::{Accepted, Overloaded} across v1, v2, and EDR submission paths.
• Return HTTP 529 with Retry-After and a retryable: true JSON payload when the broker is at capacity.
• Bump the bits-broker git dependency revision (and associated Cargo.lock entry).

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
frontend/src/lib.rs	EDR submission path now matches on SubmitOutcome and returns an upstream submit error on overload.
frontend/src/api/v2.rs	v2 submit endpoint now handles SubmitOutcome, logging and returning an overload (529) response when at capacity.
frontend/src/api/v1.rs	v1 submit endpoint now handles SubmitOutcome, logging and returning an overload (529) response when at capacity.
frontend/Cargo.toml	Updates bits git dependency rev to pick up the new SubmitOutcome API.
Cargo.lock	Locks the updated bits git revision.

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