fix: download via batch actions when single file is selected in searc…

[AlexAndBear]

…h and shared with me view

Description

Related Issue

• Fixes Downloading single shared file results in frontend Error when using the BatchAction Download button in shares view. #1932
• Fixes File download on search result page via batch action is broken #1702

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[JammingBen]

Why change the signature of the downloadFile method? Technically this would now be a breaking change for web-pkg.

[AlexAndBear]

If we kept the old signature, the method would look like this:

  space: SpaceResource = null,
  file: Resource,
  version: string = null
) => {

This signature mixes required and optional params and relies on null defaults, which is a bit messy and easy to misuse.