fix(browser): Ensure that performance.measure spans have a positive duration

[nicohrubec]

Summary

• Cherry-pick of fix(browser): Ensure that performance.measure spans have a positive duration #15415 to the v8 branch
• Third parties may emit measurements with negative durations, causing invalid spans and relay to drop transactions
• Ensures performance.measure spans always have a positive duration

Test plan

• Existing tests from original PR included in cherry-pick

🤖 Generated with Claude Code

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Bug Fixes 🐛

• (browser) Ensure that performance.measure spans have a positive duration by nicohrubec in #19959

• (v8/core) Filter gmo error and Facebook mobile error by s1gr1d in #15447

Internal Changes 🔧

• (flags/v8) Rename unleash integration param by aliu39 in #15345
• (v8) Bump to ubuntu-24.04 by onurtemizkan in #17507
• (v8/craft) Use version templating for aws layer by andreiborza in #18677

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