Add YAML editor for tools

[MoritzWeber0]

Instead of form fields in the frontend, we should configure the metadata for tools in a yaml editor.
Part of the initial YAML editor should be:

• Persistent session image(s)
• Provisioned session image(s)
• Backup image (Temporary solution until feat: Add support for pipeline plugins #722 is merged)

The YAML would shall look like:

name: Capella

persistent-sessions:
  - id: native-capella
    image: k3d-myregistry.localhost:12345/capella/remote:$version-latest
    name: Native Capella

provisioned-sessions: # optional key
  - image: k3d-myregistry.localhost:12345/capella/readonly:$version-latest
    id: native-capella # Must be unique in list of provisioned-sessions
    name: Native Capella

# Temporary solution until https://github.com/DSD-DBS/capella-collab-manager/pull/722 is merged.
# Optional key
backup-image: k3d-myregistry.localhost:12345/t4c/client/base:$version-latest

The largest changes are:

• read-only sessions are renamed to provisioned sessions. This is required for Initialize training setup, spawn related sessions #1004.
• Persistent sessions and provisioned sessions are now lists, meaning that a tool can define different images. This has to be considered during session spawning. The feature is required for Add description editor in the frontend #859.
• Each session type can have it's custom name now -> A tool can named differently than what is displayed in the session creation component.

Depends on #1135.