[9.x] Vite: ability to prevent preload tag generation from attribute resolver callback

[daniser]

This PR adds an ability to return false from preload tag attribute resolver to prevent tag generation.
For example, this is needed when adding chunks generated by @vitejs/plugin-legacy
to stop preloading unneeded scripts in modern browsers.
Current code to do so looks like this:

Vite::withEntryPoints(['vite/legacy-polyfills-legacy', "resources/js/app-legacy.js", "resources/js/app.js"])
    ->useScriptTagAttributes(function ($src) {
        return Str::contains($src, '-legacy') ? ['type' => 'text/javascript', 'nomodule'] : [];
    })
    ->usePreloadTagAttributes(function ($src) {
        return Str::contains($src, '-legacy') ? ['rel' => 'dummy'] : [];
    });

Tag is still generating, but browsers omits it due to invalid rel attribute value.

With this PR, callback will look like this:

->usePreloadTagAttributes(function ($src) {
    return Str::contains($src, '-legacy') ? false : [];
});

This will suppress preload tag generation for all scripts which name ends with "-legacy".