[testing] make use of the api integration testing framework

[vince-fugnitto]

Description

I believe we should include and make use of the API Integration Testing Framework (eclipse-theia/theia#6852), so we can more easily and effectively test our images when running CI.

We should attempt to include language specific tests for a given image (for example: testing if the Java language server starts correctly in the theia-java-docker image) among other improvements over our current tests (which only provide minimal information over the correctness of the application).

Additional Information

• api integration tests eclipse-theia/theia#6852
• https://github.com/eclipse-theia/theia/blob/master/doc/api-testing.md

[akosyakov]

We have to do eclipse-theia/theia#7028 first to avoid including tests into images.

[marcdumais-work]

We have to do eclipse-theia/theia#7028 first to avoid including tests into images.

Thanks for taking care of this, @akosyakov

[stale]

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