Use mise as the default instead of asdf

Overview

Currently, we're using asdf as the default tool for intstalling and managing software, but we want to transition to using mise as the default.

Tasks

• Update CI jobs to use mise to test the new configuration.
• Set mise.enabled to true in the default settings.
• Ensure mise updates automatically when a new version is released.
• Update documentation to reflect the switch from asdf to mise.

Impacted categories

The following categories relate to this issue:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Steps to replicate (optional)

Proposal (optional)

Environment (optional)

• Operating system name: <!-- output of `uname -a` command -->
• Architecture: <!-- output of `arch` command -->
• The contents of your gdk.yml (if any)
• Ruby version: <!-- output of `ruby --version` command -->
• GDK version: <!-- output of `git rev-parse --short HEAD` command -->