[fix][build]Added pulsar-experimental for 3.1

[mukesh-ctds]

Motivation

Explain here the context, and why you're making that change. What is the problem you're trying to solve.
Create pulasr-experimental docker image with all the builtin connectors

Modifications

• Cherry-picked commit for pulsar-experimental docker image.

• Modified the pulsar-experimental/pom.xml as per 3.1_ds

Verifying this change

• Make sure that the change passes the CI checks.

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): ( no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

Check the box below or label this PR directly (if you have committer privilege).

Need to update docs?

• doc-required

  (If you need help on updating docs, create a doc issue)

• no-need-doc

  (Please explain why)

• doc

  (If this PR contains doc changes)

[eolivelli]

LGTM