[FLINK-18356][Azure] Enforce memory limit on custom CI servers

[rmetzger]

This PR is a test on our custom CI infrastructure to see if the tests are stable if we enforce a memory limit.

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Last check on commit 44dca25 (Fri May 28 11:06:39 UTC 2021)

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CI report:

• 44dca25 Azure: FAILURE

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[rmetzger]

Looks like the blink tests are failing with a limit of 7GB :( https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=16123&view=results
Trying with 8gb now...

[rmetzger]

Replaced by #18368