OONI Probe CLI v3.26.0-alpha

This is an alpha release for creating a branching point for the release/3.26 branch. As usual, this release includes both an OONI Probe CLI release and the corresponding release of the measurement engine, which is hosted by the same repository.

What's Changed

• feat: upgrade psiphon suite to official release by @DecFox in #1704
• feat: allow disabling tests enabled tests using checkin by @DecFox in #1707
• chore: bump internal version to 3.26.0-alpha by @DecFox in #1708
• feat: introduce ech experiment based on go1.23 stdlib by @DecFox in #1705
• feat: support desktop builds for probe multiplatform by @DecFox in #1710
• chore: upgrade dependencies for release v3.26 by @DecFox in #1711
• chore: upgrade probe-assets to v0.27.0 by @DecFox in #1712
• fix: go fmt errors by @DecFox in #1713
• feat: publish desktop jar once merged by @DecFox in #1714

Full Changelog: v3.25.0-alpha...v3.26.0-alpha