fix(packager): report the correct status result when doSign exits early

[mmaietta]

fix: report the correct status result when doSign exits early from macPackager and winPackager. Updated function definition to return Promise<boolean> to properly flag intellisense

Follow-up from @nsrCodes PR: #7431

[changeset-bot]

🦋 Changeset detected

Latest commit: 13e0438

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
app-builder-lib	Patch
builder-util	Patch
dmg-builder	Patch
electron-builder-squirrel-windows	Patch
electron-builder	Patch
electron-forge-maker-appimage	Patch
electron-forge-maker-nsis-web	Patch
electron-forge-maker-nsis	Patch
electron-forge-maker-snap	Patch
electron-publish	Patch

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