Allow schema migration of block documents during Block.save

[zzstoatzz]

Adds block_schema_id to the BlockDocumentUpdate action schema to ensure that block_schema_id is passed to PATCH /block_document/{id}. This is so we can update the block_schema associated with an existing block document (if previously saved with a different block schema) when a user calls BlockWithNewSchema.save with overwrite=True, avoiding the need to delete and recreate the block document.

Closes #8015

Example

from prefect.blocks.core import Block

class Foo(Block):
   _block_type_name = "foo"
   _block_type_slug = "foo"

   x: int

foo = Foo(x=1)

foo.save("foo-block")

class Foo_Alias(Block):
   _block_type_name = "foo"
   _block_type_slug = "foo"

   x: int
   y: int

foo_alias = Foo_Alias.load("foo-block", validate=False)

foo_alias.y = 2

foo_alias.save("foo-block", overwrite=True)

# the schema ID for `foo-block` stored in Orion is now the same as the one stored on `foo_alias`, as of `save` being called

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. fix, feature, enhancement

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[zzstoatzz]

looks like I broke some tests related to updating nested block documents 🤔

investigating

EDIT:
I think I just need to update the tests in the api & models to pass a block schema ID when we're simulating BlockDocumentUpdate actions

EDIT AGAIN:
I did not need to change the models/api tests, I was just missing a check that a new block schema ID was actually passed

[desertaxle]

LGTM!