docs(readme): update outdated license information

[jdcmsd]

This fixes #35557

Proposed Changes

• Updating license info!
• Same change across 8 READMEs.
• Emphasizes BSL/Commercial license split instead of Community/Enterprise split.
• Includes links for further reading on both.
• Fifth thing

Checklist

• Probably no tests or QA needed; just README stuff.
• Security Implications: Few!

Additional Info

** nah **

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[wezell]

Good changes.