feat(bundler): consider extensions defined in main.wxs.

[chfaft]

Description

This PR extends extension support for the Tauri installer by considering not only fragment_paths for extension inclusion, but also the main main.wxs configuration file itself.
Previously, the integration of extensions was limited to fragments, making it harder to manage installer customization in a centralized location.

What’s changed

• Extensions defined in both fragment_paths and the main main.wxs file are now recognized and included during the installer build process.
• The logic for extension detection and inclusion has been unified, streamlining the handling of installer resources and extensions.

Why

This change allows developers to manage all necessary installer extensions directly in fragments as well as in template, enabling more flexible and maintainable Windows installer configurations and reducing the need to split extension logic unnecessarily.

[github-actions]

Package Changes Through a16e9d4

There are 7 changes which include @tauri-apps/api with patch, tauri with patch, tauri-cli with patch, tauri-bundler with patch, @tauri-apps/cli with patch, tauri-macos-sign with patch, tauri-utils with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.9.0	2.9.1
tauri-utils	2.8.0	2.8.1
tauri-macos-sign	2.3.0	2.3.1
tauri-bundler	2.7.3	2.7.4
tauri-runtime	2.9.1	2.9.2
tauri-runtime-wry	2.9.1	2.9.2
tauri-codegen	2.5.1	2.5.2
tauri-macros	2.5.1	2.5.2
tauri-plugin	2.5.1	2.5.2
tauri-build	2.5.2	2.5.3
tauri	2.9.3	2.9.4
@tauri-apps/cli	2.9.4	2.9.5
tauri-cli	2.9.4	2.9.5

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