test: route Tomcat archive through MASS staging (HEAD fix validation)

[tomasperezmolina]

What Does This Do

Routes the Spring Boot Tomcat archive download through MASS staging (https://mass-read.us1.staging.dog) to validate that Gradle HEAD probes work correctly after the MASS pull-through HEAD fix.

Motivation

MASS previously returned 405 Method Not Allowed for HEAD requests on artifact routes. A fix was deployed to staging that adds proper HEAD support, including a pull-through fallback so uncached artifacts return 200 (not 404) when Gradle probes before downloading.

This PR exercises that exact path: Gradle sends HEAD /internal/artifact/dlcdn.apache.org/... before the GET, MASS should return 200, and the download should complete.

Additional Notes

DO NOT MERGE — staging validation only. Once validated, the production version of this routing should use MASS_READ_URL env var (as in #11525) rather than a hardcoded staging URL.

Depends on: DataDog/dd-source#455913

[datadog-datadog-prod-us1]

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⚠️ Warnings

🚦 174 Pipeline jobs failed

Run system tests | main / End-to-end #5 / spring-boot 5     

🔧 Fix in code (Fix with Cursor).

1 failed test. AssertionError: Request failed: None. Expected status code 200 but got None in test_dynamic_evaluation.py:237.

Run system tests | main / End-to-end #1 / jersey-grizzly2 1     

🔄 Retry job. This looks flaky and may succeed on retry.

Failed to pull Docker image due to context deadline exceeded while awaiting headers from Docker registry.

Run system tests | main / End-to-end #1 / uds-spring-boot 1     

🔄 Retry job. This looks flaky and may succeed on retry.

Failed to pull Docker image 'datadog/system-tests:proxy-v1' due to timeout while authenticating with Docker registry.

View all 174 failed jobs.

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