Remove BlueprintBuilder as a possible runner input type

[reimic]

What does this PR do?

• removes the possibility of parsing a Blueprint from a BlueprintBuilder

What problem does it fix?

• the BlueprintParser's method parse could accept a BlueprintBuilder object as a potential input which could lead to errors

As context:

• the only difference between passing a Blueprint and a BlueprintBuilder was that the method toBlueprint() was called for the builder, which has little utility
• calling the method toBlueprint() on a specific instance of the BlueprintBuilder always returns the same instance of a Blueprint
• this leads to an issue where someone:
  • creates a builder,
  • sets some of the variables,
  • runs the code with success,
  • sets some more variables,
  • runs it expecting another blueprint being generated and receives an error.
• running the same Blueprint twice greatly confuses the program.

In conclusion:

• the user expected the builder to generate another instance of a Blueprint, but it just set some values to the first instance. The runner extracted the first instance instead of creating a new one.

The explicit source of this particular error will be fixed in another PR, but as an example of what could go wrong:
InvalidArgumentException: Progress cannot go backwards (tried updating to 3.0105460023897 when it already was 3.0157410774586)

How to test if it works?

• this PR only removes an execution path from the parser