What does this change do?
This change improves the `upload_theme` system test helper method by
automatically setting the uploaded theme as the default theme for the
site. This is to make it easier for users to use the theme instead of
having to fiddle with theme previews. The default behaviour of setting
the uploaded theme as the site's default theme can be disabled by
passing `false` to the `set_theme_as_default` keyword argument.
This change also introduces a new `upload_theme_component` system test
helper method for uploading theme components. The difference between the
`upload_theme` helper method is that the theme component is
automatically added to the site's default theme when uploaded. The theme
which the theme component is added to can be configured via the
`parent_theme_id` keyword argument.
For both methods, we also no longer require the path to the theme to be
provided. Instead both methods will look through the callstack and can
figure out the theme's directory based on the convention that the
theme's system tests are placed in the `spec/system` directory of the
theme folder. This change simplifies the usage of the methods for users
and helps to remove code like `upload_theme_component(File.expand_path("../..", __dir__))`.
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