Automate winget submission for stable UI releases

[niksedk]

Closes #12292 (the automation part — the 5.0.0 bump itself still needs one manual/first run, see below).

What

Adds a publish-winget job to the UI release workflow that automatically opens a version-bump PR against microsoft/winget-pkgs for Nikse.SubtitleEdit whenever a stable release is published.

How

• Runs after create-release, only when create_release is true and is_prerelease is false.
• Extra tag guard: suffixed tags (v5.1.0-beta12) and auto-generated pre-release-* tags are skipped even if the run was accidentally not marked as a pre-release; the job also skips gracefully (with a warning) if the WINGET_TOKEN secret is missing.
• Uses winget-releaser (pinned to the v2 commit), which drives komac — the same tool used for the existing 4.0.x manifests. Komac downloads the installer and re-derives ProductCode/architecture from the binary itself. That matters here: the v5 Inno installer has a new AppID ({B5E6D1E0-…}_is1), while the pre-5.x manifests say SubtitleEdit_is1 and list x86+x64 — a plain manifest copy would carry the stale values forward.
• The winget PackageVersion is the release tag without the v prefix (e.g. 5.1.0), and only SubtitleEdit-Windows-x64-Setup.exe is matched as the installer.

Setup required (one-time, before the next stable release)

1. Create a classic PAT with public_repo scope on the niksedk account (fine-grained tokens are not supported by the action).
2. Add it as a repo secret named WINGET_TOKEN.
3. The fork it pushes to is https://github.com/niksedk/winget-pkgs, which already exists (fork-user: niksedk).

Note on 5.0.0

This only fires on future release runs. For the already-published 5.0.0 (or once 5.1.0 goes stable, which supersedes it), a one-off submission can be done locally with:

komac update Nikse.SubtitleEdit --version 5.0.0 \
  --urls https://github.com/SubtitleEdit/subtitleedit/releases/download/v5.0.0/SubtitleEdit-Windows-x64-Setup.exe \
  --submit

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