upgrade pulsar to 2.10.4 for test

[nlu90]

(If this PR fixes a github issue, please add Fixes #<xyz>.)

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Motivation

2.8.1 was released two years ago which is too old for testing.

Modifications

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Verifying this change

• [ ] Make sure that the change passes the CI checks.

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

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

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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

Documentation

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