[FLINK-25583][connectors/filesystem] Prepare resources for serializer migration tests.

[pltbkd]

What is the purpose of the change

This pull request prepares the necessary resources for the recoverable and committable serializer migration tests. The migration tests will be a part of this PR that adds the support of compaction for the FileSink..

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CI report:

• 9a4393b Azure: SUCCESS

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Last check on commit 9a4393b (Mon Feb 14 14:03:23 UTC 2022)

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[gaoyunhaii]

@flinkbot run azure

[gaoyunhaii]

Thanks @pltbkd for the PR! LGTM. Would merge after green azure.