[FLINK-34733] [filesystem] Fix oss filesystem ClassNotFoundException when configure 'fs.oss.credentials.provider'.

[kocomic]

What is the purpose of the change

Fixing the exception in Alibaba Cloud OSS file system.

Brief change log

• Remove the oss filesystem hard-coded shaded prefix of 'fs.oss.credentials.provider'.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)

[flinkbot]

CI report:

• bb4009a Azure: SUCCESS

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