[FLINK-17497][e2e] Properly switch to Scala 2.12 in quickstart test

[rmetzger]

What is the purpose of the change

The quickstart test was sometimes failing because the scala 2.11 quickstart was used in the scala 2.12 build.

Brief change log

• if the scala 2.12 profile is detected, change scala version for both java and scala quickstart test to 2.12.

Verifying this change

Validated in my personal CI: https://dev.azure.com/rmetzger/Flink/_build/results?buildId=7952&view=results

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Automated Checks

Last check on commit c197990 (Thu May 07 06:49:31 UTC 2020)

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CI report:

• e8bb153 Azure: SUCCESS

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[geektcp]

sed grammar correct

[pnowojski]

LGTM % one comment and assuming fix is working

[pnowojski]

LGTM, thanks for the update @rmetzger :)

[rmetzger]

Thanks! Merged.