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StateMachine DefinitionUri doesn't accept local files

See original GitHub issue

Description:

Based on the official documentation the description of DefinitionUri is as follows:

DefinitionUri
The Amazon S3 URI or local file path of the state machine definition written in Amazon States Language.

If a local file path is provided, the template must go through the workflow that includes the sam deploy or sam package command, in order for the definition to be transformed properly.

One of Definition or DefinitionUri must be provided.

Type: String | S3Location

An example is even included:

MySampleStateMachine:
  Type: AWS::Serverless::StateMachine
  Properties:
    DefinitionUri: statemachine/my_state_machine.asl.json
    Role: arn:aws:iam::123456123456:role/service-role/my-sample-role
    DefinitionSubstitutions:
      MyFunctionArn: !GetAtt MyFunction.Arn
      MyDDBTable: !Ref TransactionTable

However, local files do not seem to be actually supported (by brief look at the feature commits) and using it results in Resource is invalid. 'DefinitionUri' is not a valid S3 Uri of the form 's3://bucket/key' with optional versionId query parameter. error message.

Having the StateMachine definition in a separate local file (possibly JSON definition and YML template) would be most useful, unlike linking separately uploaded S3 file.

Steps to reproduce the issue:

Use AWS::Serverless::StateMachine resource.
Define a local path as it’s DefinitionUri.

Observed result: Resource is invalid. ‘DefinitionUri’ is not a valid S3 Uri of the form ‘s3://bucket/key’ with optional versionId query parameter.

Expected result: Successful deployment.