[package management service] fix wrappedBuffer always using the same block of memory

[freeznet]

Fixes #11781

Motivation

When uploading file content to bk, the BookKeeperPackagesStorage always use the same block of memory to read the file content and build up a bunch of zero-copy ByteBuf.

This causes the ByteBufs having the same block of memory and break the file content.

Modifications

Alloc new memory block in each iteration.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

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

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)
• The rest endpoints: (yes / no)
• The admin cli options: (yes / no)
• Anything that affects deployment: (yes / no / don't know)

Documentation

For contributor

For this PR, do we need to update docs?

• If yes, please update docs or create a follow-up issue if you need help.

• If no, please explain why.

For committer

For this PR, do we need to update docs?

• If yes,

  • if you update docs in this PR, label this PR with the doc label.

  • if you plan to update docs later, label this PR with the doc-required label.

  • if you need help on updating docs, create a follow-up issue with the doc-required label.

• If no, label this PR with the no-need-doc label and explain why.

internal bug fix

[lhotari]

Good catch @freeznet ! I also added "release/2.7.4" since this looks like an important fix.

[lhotari]

or does it only apply to 2.8.x + ? I see that the change was made to DLOutputStream, but I guess that's not used asynchronously by Pulsar Functions upload, so that wouldn't be impacted?

[freeznet]

@lhotari thanks for asking. from my understanding this fix only applies to package management service, and not with Pulsar Functions upload, so it might not affect release 2.7.x