Add CSV Application Import test

[aufi]

There is a feature that allows upload CSV with Applications and related resources to populate the application inventory in the Hub. Write an API test that will upload sample CSV and verify created resources in the Hub.

For most of things follow what you learned in #370, just updating binding pakage is not needed in this case, the CSV can be uploaded with RichClient.Client HTTP methods. Suggested test structure is similar to previous PR, but expecting to specify list of TestCases (path to import CSV file and applications, dependencies, etc. expected be created) instead of samples.

Resources:

• import endpoint: https://github.com/konveyor/tackle2-hub/blob/main/api/import.go
• CSV upload method from ^ is https://github.com/konveyor/tackle2-hub/blob/main/api/import.go#L212
• sample CSV: https://github.com/konveyor/tackle2-ui/blob/main/client/public/template_application_import.csv

Example upload with curl: curl -F "file=@import.csv" http://localhost:8080/importsummaries/upload (not for test, just to show how the request should look like)

Part of konveyor/operator#220 for @khareyash05