FLINK-36544: [OLM] - ensure file permissions are preserved on the CSV during bundle creation.

[k-wall]

What is the purpose of the change

Bug fix: During OLM bundle creation, the generated bundle lacks necessary file permissions on the CSV. This leads to a subscription failure.

I added a comment to the JIRA showing the investigation.

Brief change log

• Ensure CSV file permissions are preserved during bundle creation.

Verifying this change

Created the OLM bundle locally.

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 changes to the CustomResourceDescriptors: no
• Core observer or reconciler logic that is regularly executed: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable