Removing out-dated testcontainers integration

[salaboy]

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Description

Removing testcontainers out-dated reference, this now is in upstream Java SDK

Issue reference

Fixes #4510

[salaboy]

@hhunter-ms @marcduiker @msfussell ping

[marcduiker]

@salaboy I think you removed a bit too much, also the Conductor page is now removed. Can you undo this?

[marcduiker]

Please add back the Conductor page.

[salaboy]

@marcduiker done

[salaboy]

@marcduiker @hhunter-ms I am not sure why the builds are failing :(

[marcduiker]

LGTM

[hhunter-ms]

@marcduiker @hhunter-ms I am not sure why the builds are failing :(

@salaboy I'm checking with @yaron2 and @msfussell - I haven't seen that error before, so I'm not sure either