Integration tests improvements

[zFernand0]

Is your feature request related to a problem? Please describe.

The main reason for this issue is the lack of integration tests that capture common end-user scenarios such as:

• Creating a new Team Config file
• Interacting with Datasets: CRUD (Create, Read, Upload/Update, Delete)
• Interacting with USS Files: CRUD
• Interacting with JES Jobs: Submit, View, Download, Delete
• Running MVS and TSO Commands

Describe the solution you'd like

Create new *.integration.test.ts files inside our __integration__ folder.

Note: This new tests should be able to run in native VSCode, in Theia, and possibly other supported environments.

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For more info, see #265 (comment)

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