Add importer tests

[marcusmoore]

Description

This PR takes the work from #15579 and #15616 and merges them into the develop branch.

(The test/importer-tests branch can be deleted after this merge)

[what-the-diff]

PR Summary

• Upgrades to the Asset and Import Models:

  • The Asset model now has improved code formatting and additional checking for null values.
  • The Import model includes the HasFactory trait, enhancing the creation process of different types of data.

• Implementation of ImportFactory and Updated UserFactory:

  • A new ImportFactory allows the creation of different import types like accessories, assets, users etc.
  • The UserFactory also gained upgrades with new type hints.

• Creation of New Test Classes:

  • New test classes have been created; GeneralImportTest and ImportComponentsTest, these facilitate thorough testing of importing functionality, involving authorization, validation, and handling of known and unknown columns.
  • Additional testing scenarios have been added to ensure the precise importing of components, even in edge cases.

• Addition of Specific Import Tests:

  • New ImportConsumablesTest and Custom Column Mapping Test have been enacted to handle the specific conditions of consumables and customized columns during the importing process.
  • An ImportDataTestCase class is created to provide a standard way to make import file requests.

• Enhanced User Import Testing:

  • A new test file ImportUsersTest.php has been added, aimed at importing users with multiple checks for permissions, functionality, and validation.
  • To aid in the importing process, new classes including AccessoriesImportFileBuilder.php, AssetsImportFileBuilder.php, ComponentsImportFileBuilder.php, ConsumablesImportFileBuilder.php have been created.
  • To ensure the cleanup of import files after tests and avoid unwanted accumulation, CleansUpImportFiles.php trait is now in service.

• Creation of FileBuilder Class and Its Extensions:

  • The new FileBuilder abstract class manages collections of imported files, providing ways to manipulate and output these as CSVs.
  • New classes LicensesImportFileBuilder and UsersImportFileBuilder have been introduced extending FileBuilder, with specialized functions for mapping row attributes and generating mock data.