Cardano Updates

Allows to decode normal blocks as "inline txs" blocks in the
Leios-enabled world. This is useful to replay old praos blocks and be
able to still decode them in this (hackily patched) era.

Refactor such that each example from an era is build on top of the
example of the previous era.

Allows:
* reduced duplication
* each example of each era has most fields set with values

Update block and tx cbor golden files given changes in the block and
transation content.

Refactor such that each example from an era is build on top of the
example of the previous era.

Allows:
* reduced duplication
* each example of each era has most fields set with values

Update block and tx cbor golden files given changes in the block and
transation content.

Validation checks that:

* current protocol version is within the era's bounds
* previous protocol version is at most the current version
* previous protocol version + 1 is within the era's protocol version bounds

Stop running `bump-changelogs` on release branches

Resolves #5706

Closes #5694