[Moving] Move Dataset Quality folder into /x-pack/observability_solution

[CoenWarmer]

Summary

This PR is part of the initiative to consolidate Observability plugins into x-pack/plugins/observability_solution.

This PR is strictly a move and an update in references.

This was discussed and agreed upon with the Observability org in the Observability Office Hours meeting at the end of 2023.

Related PRs:

• Move APM
• Move Data Quality <-- you are here
• Move Exploratory View
• Move Infra
• Move Logs Explorer
• Move Logs Shared
• Move Observability AI Assistant
• Move Observability App
• Move Observability Onboarding
• Move Observability Shared
• Move Profiling
• Move Synthetics
• Move Uptime
• Move UX

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[yngrdyn]

LGTM, all new changes were moved and conflicts removed.
Thanks for doing this 🚀

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