Store schema in shared cache Fix logic regarding fetching one schema at a time

[u12206050]

This adds the schema to the redis cache as well as fixes the lock logic surrounding fetching the schema.

Testing locally with redis server and pm2 to spawn multiple containers shows significant improvement.

Fixes: #22243

[changeset-bot]

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Latest commit: b5bdde1

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[u12206050]

Here is an historic view of our production environment of how the various changes within the PR made an impact:

This shows a 92.86% reduction in the average time to get the schema.