Unbreak generate-release-yml.rs, update Ubuntu/Fedora Docker bases

[ckwalsh]

generate-release-yml.rs:

• Seems like rust-script is picky with the comment format for cargo
  dependencies. Switching from /* */ to //! allows is to correctly
  build the script.
• Remove Ubuntu 20.04 (gcc too old)
• Add Ubuntu 24.04 (latest LTS)
• Remove Fedora 36/37/38 (38 support ended 2024-05-21)
• Add Fedora 40/41/42 (42 to be released 2025-04-22)

release.yml.in:

• Bump action versions
• Switch from watchman-build-env-DISTRO-VERSION:latest to
  watchman-build-env:DISTRO-VERSION-latest. This will avoid package
  name changes when versions are bumped, which can trigger non-obvious
  permission issues.
• Bump linux-build job from ubuntu-20.04 to ubuntu-24.04
• Regenerate release.yml

package.yml:

• Bump action versions
• Switch from ubuntu-22.04 to ubuntu-24.04

Test Plan:

cd ~/github/watchman/.github/workflows/
./generate-release-yml.rs

cd ~/github/watchman
docker build --build-arg UBUNTU_VERSION=22.04 -f watchman/build/package/ubuntu-env/Dockerfile .
docker build --build-arg UBUNTU_VERSION=24.04 -f watchman/build/package/ubuntu-env/Dockerfile .
docker build --build-arg FEDORA_VERSION=40 -f watchman/build/package/fedora-env/Dockerfile .
docker build --build-arg FEDORA_VERSION=41 -f watchman/build/package/fedora-env/Dockerfile .
docker build --build-arg FEDORA_VERSION=42 -f watchman/build/package/fedora-env/Dockerfile .

git tag v2025.02.27.00
git push origin v2025.02.27.00
# Compare https://github.com/ckwalsh/watchman/actions/runs/13576588547 vs https://github.com/facebook/watchman/actions/runs/13502516295
# Note - cancelled full build to avoid GitHub Actions Billing

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[chadaustin]

Thanks Cullen, much love. Several people will appreciate these fixes. Trying to get it through internal CI now.

[ckwalsh]

Heh, shipit broken for Watchman?

Good to see it landed so quickly, thanks

[facebook-github-bot]

This pull request has been merged in 9968dc4.