refactor: consolidate ballista tests

[milenkovicm]

there was a bit of repeatibility in the test, same tests were used for standalone and remote context.

this PR introduces:

• rstest to parametrise tests, so we can re-use tests for standalone and remote
• enable previously ignored tests due to unsupported functionality (like INSERT INTO) to catch if datafusion brings new changes
• testcontainers tests moved to example to reduce duplication (they are still disabled as i could not make them connect to docker deamon)

Which issue does this PR close?

Closes none.

Rationale for this change

simplification and de-duplication of tests

What changes are included in this PR?

• rstest to parametrise tests, so we can re-use tests for standalone and remote
• enable previously ignored tests due to unsupported functionality (like INSERT INTO) to catch if datafusion brings new changes
• testcontainers tests moved to example to reduce duplication (they are still disabled as i could not make them connect to docker deamon)

follow up PR will move files to centralised location as there may be few duplicates

Are there any user-facing changes?

No, just tests