Backport Block Renaming Default Attributes

[getdave]

As per discussion in https://github.com/WordPress/gutenberg/pull/54426/files#r1334343353 let's make metadata a standard attribute for all blocks in the same way as for lock attribute.

https://github.com/WordPress/wordpress-develop/blob/a80165b78f2367f92e2eff679c4e035d1c5bdc7c/src/wp-includes/class-wp-block-type.php#L248-L250

Originally posted by @getdave in #54426 (comment)

[gziolo]

@ockham opened PR WordPress/wordpress-develop#5608 to set metadata as a global attribute in WordPress core.

[ockham]

@ockham opened PR WordPress/wordpress-develop#5608 to set metadata as a global attribute in WordPress core.

Committed to Core in https://core.trac.wordpress.org/changeset/57068.