Initial Filters is not respected when array type filter

When the user supplies an array type filter with initialFilters, the initialFilters are never used. The filter logic has the following code:

	  const urlValue = isArrayFilter ? searchParams?.getAll(key) : searchParams?.get(key);

      // eslint-disable-next-line no-nested-ternary
      loadedFilters[key] = urlValue
        ? (isArrayFilter && !Array.isArray(urlValue) ? [ urlValue ] : urlValue)
        : initialFilters[key];

The issue is that searchParams.getAll returns an empty array when key doesn't exist, so the truthy check on urlValue evaluates to true even though nothing is set.

This can be resolved by checking the length of the array when isArrayFilter is true

Jira Issue: PF-4302

从 issue 中展示的过滤器逻辑开始，跟踪 URL 键缺失时 array 过滤器和 initialFilters 的加载方式。使用 array 类型的过滤器重现该情况，并验证在不存在 URL 值时，已配置的初始值仍会保留。