Refactor FindHelper.SearchByNames() method

[anamnavi]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.

Steps to reproduce

Refactor this method as it's quite long. As mentioned in this older PR: https://github.com/PowerShell/PowerShellGet/pull/1065#discussion_r1175662091

Expected behavior

Method should be refactored into smaller helper methods

Actual behavior

Not done yet.

Error details

No response

Environment data

platform agnostic.

Visuals

No response