chore: update stage2-prod mock config

[reubeno]

Now that PROD is building stage2 against stage2, we need to remove the stage1 compat package from the buildroot.

We also remove some forcibly-set macros to be more consistent with koji configuration in PROD; this enables us to reproduce some package build failures that show up without these set.

Validation

Tested with local package building via: azldev comp build --config-file distro/stage2-prod.toml and multiple packages.

[Copilot]

Pull request overview

Updates the production Stage 2 mock buildroot to match current Koji behavior.

Changes:

• Removes the obsolete Stage 1 compatibility package.
• Stops forcibly defining RPM distribution macros.

[tobiasb-ms]

question(blocking): What validation has been done on this? For example, have we validated that even without config_opts['macros']['%dist'] = '.azl4', things still end up with .azl4?

[reubeno]

question(blocking): What validation has been done on this? For example, have we validated that even without config_opts['macros']['%dist'] = '.azl4', things still end up with .azl4?

@tobiasb-ms Good question; I've updated the PR description to reflect this, but the short version is that I used it with local azldev builds and several packages.

As for the other part of your question -- and this is the most interesting bit -- the whole point of that part of the change is to match what's happening in PROD koji, in which we've also removed the setting. And we have 3 packages where we don't end up with .azl4 -- and they're real problems we're working through. With this change we can now faithfully reproduce those failures locally.

(For those curious about those cases -- they're packages where upstream Fedora has force-enabled bootstrap and ended up with a .azl4~bootstrap in the dist tag. We're now seeing the same behavior that upstream does for them.)