Replace CertificatesSupportedInEra with ShelleyBasedEra

[newhoggy]

Changelog

- description: |
    Delete `CertificatesSupportedInEra`.  Use `ShelleyBasedEra` instead.
    Delete `certificatesSupportedInEra`.  Use `inEonForEra` instead.
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Context

Checklist

• Commit sequence broadly makes sense and commits have useful messages
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• New tests are added if needed and existing tests are updated. These may include:
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• Self-reviewed the diff

[newhoggy]

This function is simplified via the use of shelleyBasedEraConstraints.

[carbolymer]

Can we replace this with

Suggested change

	data TxCertificates build era where
	type TxCertificates build era
	= Featured ShelleyBasedEra era
	( [Certificate era]
	, BuildTxWith build (Map StakeCredential (Witness WitCtxStake era))
	)

?

Feels like it would simplify era-witness checking down the line.

[newhoggy]

Yep. Can do that in a future commit.

[Jimbo4350]

Please don't. Having this as a data definition makes it clearer what it is when using it.

[Jimbo4350]

🚀