Tech debt: Post `v6.0.0-beta1` tasks

[ewbankkit]

Some considerations for post-v6.0.0-beta1, but during the v6.0.0 beta:

• Per-resource Region override phase II - Framework resources  #42131 (comment): Consider flipping the boolean flags in the generated ServicePackage<thing>Region structure so that exceptions stand out more clearly. Decided against this but simplified via ServicePackageResourceRegion: Use factory functions #42548.
• Consider merging internal/provider and internal/provider/fwprovider as there is more and more duplicated code: Technical debt: Reduce duplication between internal/provider and internal/fwprovider #42835. Don't combine, but simplify and move shared validation code to conns.AWSClient
• Revisit the Optional+Computed behavior of removing any configured value for region -- should this force back to the provider's configured Region? Only if someone complains 😄.
• Update tfproviderdocs to check for region: Enable -enable-enhanced-region-check for tfproviderdocs #42871
• Run deadcode

Relates #42384.

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[ewbankkit]

Closed via #43032.

[github-actions]

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