Enable swift PM tests on Linux and macOS

[vox-humana]

Follow up from #116

• Removed UIKit.UIImage dependency from tests.
• Added a simple GitHub action that runs swift test on Linux and macOS. Not sure whether it should be integrated in https://github.com/WeTransfer/WeTransfer-iOS-CI.
• Changed the order of build steps in test target as Xcode build was failing with:

  error: Cycle inside Mocker; building could produce unreliable results. This usually can be resolved by moving the target's Headers build phase before Compile Sources.

• Had to change integration of resource files in the test target as copying them on Linux cases this crash.
• Two tests (testMockCachePolicy and testRedirectResponse) were disabled on Linux as seems that swift-corelibs-foundation doesn't support these features.

[wetransferplatform]

	Messages
:book:	View more details on Bitrise
:book:	MockerTests: Executed 25 tests (0 failed, 0 retried, 0 skipped) in 1.704 seconds

SwiftLint found issues

Severity	File	Reason
Warning	MockedData.swift:12	Types used for hosting only static members should be implemented as a caseless enum to avoid instantiation. (convenience_type)
Warning	MockerTests.swift:163	Line should be 140 characters or less: currently 151 characters (line_length)
Warning	MockerTests.swift:181	Line should be 140 characters or less: currently 149 characters (line_length)
Warning	MockerTests.swift:239	Line should be 140 characters or less: currently 154 characters (line_length)
Warning	MockerTests.swift:52	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:71	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:94	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:116	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:149	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:165	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:183	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:206	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:259	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:435	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)
Warning	MockerTests.swift:469	Chained function calls should be either on the same line, or one per line. (multiline_function_chains)

Code Coverage Report

Name	Coverage
Mocker.framework	86.42%	✅

Generated by :no_entry_sign: Danger Swift against 5295a258aafc6eedb59ba50be1b6d65298b3db17

[wetransferplatform]

Congratulations! :tada: This was released as part of Release 2.6.0 :rocket:

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