fix(cdk): Remove remediation language from generic 400 error message (AI-Triage PR)

[devin-ai-integration]

fix(cdk): Remove remediation language from generic 400 error message (AI-Triage PR)

Summary

Simplifies the CDK's default 400 error message from "HTTP Status Code: 400. Error: Bad request. Please check your request parameters." to "Bad request.".

The old message violated error message guidelines:

• Embedded remediation language ("Please check your request parameters")
• Redundant HTTP status code prefix (already available in logs/UI context)

This is the generic fallback for any connector that doesn't define a custom HttpResponseFilter for 400 responses. Connectors that need API-specific context should add their own HttpResponseFilter with interpolated error messages (e.g., {{ response.message }}).

Related to https://github.com/airbytehq/airbyte-internal-issues/issues/15976
Related to https://github.com/airbytehq/oncall/issues/11577

Review & Testing Checklist for Human

• Is "Bad request." too terse? The old message was unhelpful but at least verbose. Consider whether a middle ground like "Bad request. The server rejected the request." would be better, or whether brevity is preferred since connectors should override this with specific messages via HttpResponseFilter.
• FailureType is still system_error — a 400 is often a config_error (bad user-provided parameters). This PR does not change the classification. Verify this is intentional / acceptable to defer.
• Inconsistency with other messages — Other entries in default_error_mapping.py (e.g., 403, 429) still use the "HTTP Status Code: X. Error: ..." pattern. Confirm whether this inconsistency is acceptable or if a broader cleanup is expected.

Notes

• This is a Draft PR created during AI triage of an oncall issue. It addresses only the CDK-level generic message; the connector-level fix (adding an HttpResponseFilter to source-paypal-transaction's list_disputes stream) is tracked separately.
• Unit tests updated and passing locally (26/26).

Requested by: bot_apk
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PyTest Results (Fast)

3 892 tests  ±0   3 880 ✅ ±0   6m 49s ⏱️ +3s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit fdf7a58. ± Comparison against base commit f550424.

This pull request removes 1 and adds 1 tests. Note that renamed tests count towards both.

unit_tests.sources.declarative.requesters.error_handlers.test_default_error_handler ‑ test_default_error_handler_with_custom_response_filter[_with_http_response_status_400_fail_with_default_failure_type-400-test_response_filter0-ResponseAction.RETRY-FailureType.system_error-HTTP Status Code: 400. Error: Bad request. Please check your request parameters.]

unit_tests.sources.declarative.requesters.error_handlers.test_default_error_handler ‑ test_default_error_handler_with_custom_response_filter[_with_http_response_status_400_fail_with_default_failure_type-400-test_response_filter0-ResponseAction.RETRY-FailureType.system_error-Bad request.]

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PyTest Results (Full)

3 895 tests  ±0   3 883 ✅ ±0   11m 13s ⏱️ -1s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit fdf7a58. ± Comparison against base commit f550424.

This pull request removes 1 and adds 1 tests. Note that renamed tests count towards both.

unit_tests.sources.declarative.requesters.error_handlers.test_default_error_handler ‑ test_default_error_handler_with_custom_response_filter[_with_http_response_status_400_fail_with_default_failure_type-400-test_response_filter0-ResponseAction.RETRY-FailureType.system_error-HTTP Status Code: 400. Error: Bad request. Please check your request parameters.]

unit_tests.sources.declarative.requesters.error_handlers.test_default_error_handler ‑ test_default_error_handler_with_custom_response_filter[_with_http_response_status_400_fail_with_default_failure_type-400-test_response_filter0-ResponseAction.RETRY-FailureType.system_error-Bad request.]