fix: support array of publisher names in Azure signing config

[lidel]

This PR:

• updates WindowsAzureSigningConfiguration to accept publisherName as string | Array | null
• aligns JSON schema to match TypeScript type definition
• allows specifying multiple publisher names for certificate flexibility across certificate changes
• no functional changes, implementation already handles arrays via asArray() helper and I've confirmed that in fix(windows): update publisher name ipfs/ipfs-desktop#3013 where we use this patch to fix our windows release

this change makes the schema match the existing documentation which states "Several names can be provided"

[changeset-bot]

🦋 Changeset detected

Latest commit: 25477b3

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

This PR includes changesets to release 8 packages

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

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[mmaietta]

Looks like there's some compiler errors from the logs:

Error: packages/app-builder-lib/src/codeSign/windowsSignAzureManager.ts(99,5): error TS2322: Type 'Promise<string | string[] | null>' is not assignable to type 'Promise<string>'.
  Type 'string | string[] | null' is not assignable to type 'string'.
    Type 'null' is not assignable to type 'string'.
Error: packages/app-builder-lib/src/options/winOptions.ts(136,12): error TS2411: Property 'publisherName' of type 'string | string[] | null' is not assignable to 'string' index type 'string | Nullish'.