fix(ci): suppress nightly generated release notes

[zouyonghe]

Summary

This PR stops nightly GitHub releases from using GitHub's generated release notes.

The nightly release uses a stable nightly tag that is updated repeatedly. With generate_release_notes: true, GitHub compares the moving nightly tag against repository history and can show a very large "What's Changed" section containing unrelated or accumulated PRs. That makes the nightly release page noisy and misleading for users who only need the current package metadata and assets.

The workflow now enables generated release notes only for non-nightly builds, so stable/tag-poll releases keep their generated changelog while nightly releases keep the explicit workflow body. A workflow-level regression test was added so the nightly exception does not get removed accidentally.

Test Plan

• pnpm run test:prepare-resources
• git diff --check

Summary by Sourcery

Adjust nightly desktop release workflow to avoid using GitHub-generated release notes while keeping them for non-nightly builds.

CI:

• Conditionally disable GitHub-generated release notes in the desktop Tauri release job when the build mode is nightly.
• Add a workflow test ensuring the nightly release job keeps generated release notes disabled.

[sourcery-ai]

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[gemini-code-assist]

Code Review

This pull request adds a new test case to the CI workflow testing suite to verify that generated release notes are disabled for nightly builds. It introduces a constant for the release job and implements an assertion to check the 'generate_release_notes' configuration in the GitHub Actions workflow. I have no feedback to provide as there were no review comments to evaluate.