Automate the documentation of Autosubmit variables (for job, platform, and project)

Closes #951

See merge request !340

Augment the copied/generated Autosubmit configuration with the comments for parameters from the code

documentation for variables. Two decorators are available
now, @autosubmit_parameters, used to annotate classes
with a dictionary with groups and their parameters.
And @autosubmit_parameter (singular) used to annotate
@property members. This latter decorator uses the
__doc__ (docstring) of the properties to create the
variable documentation.

Remove more .. files created in tests

See merge request !333

Remove unused WrongTemplateException

Closes #1015

See merge request !334

Parameters

See merge request !338

Print the folder of the experiment created

Closes #1017

See merge request !335

Create an error_message property on the AutosubmitError.

Closes #972

See merge request !326

Replace As by Autosubmit

See merge request !331