Remove inefficient namespace clone.

[davinchia]

What

Testing shows this is causing ~ 5MB/s of throughput on the platform. This is not needed since we can simply modify the already present Json node instead of a cloned object.

This should help both CPU and GC pressure.

How

• Remove the clone.
• Adjust test to accommodate the newly removed clone. The test previously had set up that relied on mapper cloning the input to pass.

Recommended reading order

Both files.

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed.

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[github-actions]

Airbyte Code Coverage

File	Coverage [98.7%]	🍏
NamespacingMapper.java	98.7%	🍏

Total Project Coverage	26.77%	🍏