apollo_infra: add request max size tests

[Itay-Tsabary-Starkware]

Note

Medium Risk
Changes the serialized ServerError returned for oversized requests, which can break clients/tests that pattern-match on the previous RequestDeserializationFailure variant. Otherwise the change is localized (HTTP size limit path + new tests) and low complexity.

Overview
Remote server now returns a distinct ServerError::RequestBodyTooLarge when an incoming HTTP request exceeds max_request_body_bytes, logging it at warn and responding with 413 Payload Too Large.

Adds max_request_size_test to validate the 413/RequestBodyTooLarge behavior and that the remote client surfaces ClientError::ResponseParsingFailure when a response exceeds max_response_body_bytes; also centralizes FAST_FAILING_CLIENT_CONFIG into tests::test_utils for reuse.

^{Reviewed by Cursor Bugbot for commit f071271. Bugbot is set up for automated code reviews on this repo. Configure here.}

[reviewable-StarkWare]

This change is 

[Itay-Tsabary-Starkware]

• apollo_infra: add request max size tests #13559 👈 (View in Graphite)
• apollo_infra: add keepalive time greater than 1 validation #13694 : 1 other dependent PR (#13696 )
• apollo_infra: rename and move definition of tcp keepalive factor #13693
• apollo_infra: move test utils to relevant module #13692
• apollo_infra: organize tests #13686
• main

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[graphite-app]

Merge activity

• Mar 29, 4:28 PM UTC: This pull request can not be added to the Graphite merge queue. Please try rebasing and resubmitting to merge when ready.
• Mar 29, 4:28 PM UTC: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..
• Apr 12, 10:20 AM UTC: This pull request can not be added to the Graphite merge queue. Please try rebasing and resubmitting to merge when ready.
• Apr 12, 10:20 AM UTC: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..

[github-actions]

Artifacts upload workflows:

• Started at 2026-04-12T09:36:48Z

[cursor]

PR Summary

Medium Risk
Medium risk because it changes the server’s on-the-wire error variant for oversized request bodies (now ServerError::RequestBodyTooLarge with 413), which could affect clients that pattern-match on ServerError values. The rest is additive test coverage and small test refactoring.

Overview
Adds explicit handling for oversized HTTP request bodies in the remote component server: the Limited-body collection failure now returns 413 Payload Too Large with a new ServerError::RequestBodyTooLarge variant (and logs at warn), instead of reusing RequestDeserializationFailure.

Introduces max_request_size_test to assert server-side request rejection at max_request_body_bytes and client-side failure when a response exceeds max_response_body_bytes, and refactors test config by moving FAST_FAILING_CLIENT_CONFIG into shared test_utils.

^{Reviewed by Cursor Bugbot for commit fbb1c23. Bugbot is set up for automated code reviews on this repo. Configure here.}

[matanl-starkware]

@matanl-starkware reviewed 6 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Itay-Tsabary-Starkware).