[skip-changelog]Migrate tests from upload_test.py to test_upload.go (#2001)

* Migrate TestUpload from test_upload.py to upload_test.go

* Migrate TestUploadWithInputDirFlag from test_upload.py to upload_test.go

* Migrate TestUploadWithInputFileFlag from test_upload.py to upload_test.go

* Migrate TestCompileAndUploadCombo from test_upload.py to upload_test.go

* Migrate TestCompileAndUploadComboWithCustomBuildPath from test_upload.py to upload_test.go

* Migrate TestCompileAndUploadComboWithPdeExtension from test_upload.py to upload_test.go

* Migrate TestUploadSketchWithPdeExtension from test_upload.py to upload_test.go

* Migrate TestUploadWithInputDirContainingMultipleBinaries from test_upload.py to upload_test.go

* Migrate TestCompileAndUploadComboSketchWithMismatchedCasing from test_upload.py to upload_test.go

* Migrate TestUploadSketchWithMismatchedCasing from test_upload.py to upload_test.go

* Migrate TestUploadToPortWithBoardAutodetect from test_upload.py to upload_test.go

* Migrate TestCompileAndUploadToPortWithBoardAutodetect to upload_test.go and delete test_upload.py

Author: MatteoPologruto