Test PR: deprecate WordCloudXBlock and extract it to xblocks-contrib repo

[farhan]

refactor: deprecate WordCloudXBlock and extract it to xblocks-contrib repo

This a test PR to test this PR exist in xblock-contrib

Ticket: #34840
Relevant PR: openedx/xblocks-contrib#4

Description

Describe what this pull request changes, and why. Include implications for people using this change.
Design decisions and their rationales should be documented in the repo (docstring / ADR), per
OEP-19, and can be
linked here.

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[farhan]

Closing it as we have implemented Django Settings Flag which should be used for testing.
#35549