Context

Some encoding that used the deprecated endorsing naming are not yet updated, as shown in !9192 (merged).

This MR introduce block_header_metadata_encoding_with_legacy_attestation_name function in the environment

This MR depends on !9397 (merged)

Manually testing the MR

Tests come in a following MR : !9253 (merged)

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n/a Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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Edited Jul 12, 2023 by Albin Coquereau