fix: [client] Stop force-JSON-parsing non-JSON restSearch bodies

[elhoim]

BLUF — Return non-JSON restSearch bodies as raw text instead of failing on a successful response.

• Problem — check_response() in src/client.rs ran serde_json::from_str on every 2xx body, so search() with any of the nine non-JSON ReturnFormat values (Csv, Xml, Text, Stix, Suricata, Snort, Yara, Rpz, OpenIoc) failed with MispError::JsonError.
• Fix — Split it into check_status plus check_response plus new check_response_raw/post_raw, added ReturnFormat::is_json() in src/search.rs, and routed those formats to a raw path returning Value::String(text).
• Effect — Nine of eleven return formats now work, matching PyMISP, which decodes only json and yara-json.
• CI — Red for repo-level reasons unrelated to this PR: the job ran on ubuntu-22.04 (no php8.3 mod_php) and test_event_crud_lifecycle raced the publish worker; both fixed in PR fix: [ci] Run integration tests on ubuntu-24.04 to match php8.3 #53.

Finding

check_response always JSON-parses 2xx bodies, breaking 9 of 11 ReturnFormats
Csv, Xml, Text, Stix, Suricata, Snort, Yara, Rpz, OpenIoc return non-JSON, so a successful response becomes MispError::JsonError. PyMISP returns raw text for everything except json/yara-json.

Change

check_response() in src/client.rs unconditionally ran serde_json::from_str on every 2xx body, so MispClient::search() with a non-JSON ReturnFormat (Csv, Xml, Text, Stix, Suricata, Snort, Yara, Rpz, OpenIoc) turned a successful response into MispError::JsonError. Split check_response into a shared check_status (status/error handling) plus check_response (JSON) and a new check_response_raw (raw text) / post_raw(), added ReturnFormat::is_json() in src/search.rs, and made search() route non-JSON formats through the raw path, returning Value::String(text) instead of parsing. client_blocking.rs just forwards to the async search(), so it needed no change.

Upstream evidence

pymisp/pymisp/api.py: search() at ~line 3082-3083 — elif return_format not in ['json', 'yara-json']: return self._check_response(response) — only json/yara-json get JSON-decoded, csv gets a similar raw-text branch at 3076-3081. _check_response at 4068-4108: tries loads(response.content) and, on failure, returns response.text (or response.text unconditionally for lenient_response_type non-JSON content-type) rather than raising. This confirms PyMISP returns raw text for non-json/yara-json return formats instead of forcing JSON parsing.

Verified against MISP core 843b6744 and PyMISP e7debb4f.

Tests

• search_csv_returns_raw_text_not_json_error (client.rs) — mocks returnFormat=csv restSearch returning a raw CSV body; fails with MispError::JsonError before the fix, passes and asserts Value::String(csv_body) after
• search_json_still_parses_json_body (client.rs) — pins that returnFormat=json still goes through the JSON path unchanged

Caveats

yara-json is a distinct PyMISP return_format value that decodes as JSON but is not modeled in the rustmisp ReturnFormat enum (only Yara exists, which is correctly treated as raw text) — that's a pre-existing enum-completeness gap, out of scope for this fix. client_blocking.rs's search() is a thin wrapper over the async client and required no change since it inherits the fix automatically. No cargo build/test/clippy was run per task constraints; cargo fmt was run and applied.

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Verified locally: cargo fmt --check, cargo clippy --all-targets --all-features -- -D warnings, cargo test --all-features --lib, --test integration_tests --no-run, and cargo check --examples, each in an isolated target directory.

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