fix: supress errors for headers call in open media

[alejandro-jimenez-dcl]

Pull Request Description

What does this PR change?

https://decentraland.sentry.io/issues/6428116480/
Suppresses error logging for HEAD reachability checks in OpenMediaPromise when validating media stream URLs

Test Instructions

1. Enter a scene that uses video streaming.
2. Verify the media plays correctly.
3. Check the logs, no 404 specifically in 40,54

Given how important video streaming is, please check as many scenes and examples as possible.

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered
• For SDK features: Test scene is included

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	67d4714
Logs	https://github.com/decentraland/unity-explorer/actions/runs/24070506915
Download Windows	https://github.com/decentraland/unity-explorer/suites/63575558726/artifacts/6301723043
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/open-media-404-error/pr-20744-67d4714/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/63575558726/artifacts/6301678432
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/open-media-404-error/pr-20744-67d4714/Decentraland_macos.zip
Built on	2026-04-07T08:29:42Z

[claude]

Claude finished @alejandro-jimenez-dcl's task in 35s —— View job

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PR Review

• Read changed files
• Analyze code quality and correctness
• Post review findings

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No issues found. The implementation is correct:

• suppressErrors = true is threaded cleanly through IsHeadReachableAsync → HeadAsync → SendAsync, suppressing ReportHub.LogError in WebRequestController.cs:97 for expected 404s during HEAD reachability checks.
• The existing fallback to IsGetReachableAsync on failure is preserved.
• GenericDownloadHandlerUtils.cs correctly passes suppressErrors to the constructor instead of hardcoding false.

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REVIEW_RESULT: PASS ✅
COMPLEXITY: SIMPLE
QA_REQUIRED: YES

[github-actions]

Auto-approved by Claude — simple fix/chore with no blocking issues. QA approval is still required.