[FLINK-24739][BP-1.14] Highlight the fact that the Application Mode excpects user jars to be bundled with the Flink distribution.

[dmvk]

Backport of #17678

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• 251c0e3 Azure: PENDING

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Last check on commit 251c0e3 (Tue Nov 23 08:51:37 UTC 2021)

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