Inconsistency on add_ons metadata in pyproject.toml when none

[SajidAlamQB]

Description

There is an inconsistency on what value add_ons in pyproject.toml is assigned.

Case 1:

kedro new --addons=none

pyproject.toml:

[tool.kedro]
add_ons = ""

Case 2:
kedro new (Use default value for add-ons, none, by pressing enter without typing any add-ons)

pyproject.toml:

[tool.kedro]
add_ons = "[]"

We should keep consistency in how to label none.

[AhdraMeraliQB]

Closing as no longer applicable, all none selections will result in a value of ["None"] in the project's pyproject.toml. xref the file refactor, the developer docs.