[Housekeeping] Align seperate modal version and combine into one (Modal v1 <- v2)

[mark-drastrup]

• [X] I have written a good issue

⚠️ This issue is dependent on the new alert issue ⚠️

By cleaning up the old modal code we will delete the alert as well, since it is instantiated through the modal controller.

Describe the housekeeping request

When the experimental modal becomes the new default modal, we should remember to clean up the following files and foldes:

Folders

• Delete the full modal folder at libs/designsystem/modal/src. The experimental folder should become the new src.
• Delete the full examples folder in the cookbook at apps/cookbook/src/app/examples/modal-example
• Delete the full showcase folder in the cookbook at apps/cookbook/src/app/showcase/modal-showcase

Files

• Remove global styles from libs/core/src/scss/_global-styles.scss
• Remove variables and maps from libs/core/src/scss/base/_variables.scss
• Remove all ModalController logic from libs/designsystem/src/lib/kirby.module.ts

After all the files have been removed, then all the modal-experimental names must be changed to modal. When the renaming is done the following files should be updated:

• Remove the path to the experimental modal from libs/designsystem/tsconfig.json
• Remove the path to the experimental modal from libs/designsystem/tsconfig.spec.json
• Remove the path to the experimental modal from apps/flows/tsconfig.json
• Remove the path to the experimental modal from apps/cookbook/tsconfig.json

[RasmusKjeldgaard]

We are introducing the declarative modal in modal v1 instead to avoid heavy refactoring in consumer projects. Modal v2 can be removed when the declarative modal is introduced to modal v1 as teams will have a vialbe migration path away from v2.