FIX / Improve project creation via template with read-only preview of project tabs

[Mary-Clb]

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.
• This change requires a documentation update.

Description

It fixes !40258
Replace #22265
The project creation via templates workflow had a confusing UX where users could add elements as tasks and teams to templates, thinking they were creating actual projects.

This PR implements a comprehensive read-only preview of the project tabs when it is not registered :

[trasher]

LGTM, please fix Psalm issues

[cedric-anne]

Suggested change

	echo __('You are viewing contracts from the template. Save the project first to be able to add or modify contracts.');
	echo __s('You are viewing contracts from the template. Save the project first to be able to add or modify contracts.');

[cedric-anne]

Suggested change

	echo __('You are viewing documents from the template. Save the project first to be able to add or modify documents.');
	echo __s('You are viewing documents from the template. Save the project first to be able to add or modify documents.');

[cedric-anne]

Suggested change

	echo __('You are viewing items from the template. Save the project first to be able to add or modify linked items.');
	echo __s('You are viewing items from the template. Save the project first to be able to add or modify linked items.');

[cedric-anne]

Suggested change

	echo __('You are viewing ITIL objects from the template. Save the project first to be able to add or modify linked tickets, problems or changes.');
	echo __s('You are viewing ITIL objects from the template. Save the project first to be able to add or modify linked tickets, problems or changes.');

[cedric-anne]

Suggested change

	echo __('You are viewing knowledge base items from the template. Save the project first to be able to add or modify linked articles.');
	echo __s('You are viewing knowledge base items from the template. Save the project first to be able to add or modify linked articles.');

[cedric-anne]

Suggested change

	echo __('You are viewing notes from the template. Save the project first to be able to add or modify notes.');
	echo __s('You are viewing notes from the template. Save the project first to be able to add or modify notes.');

[cedric-anne]

Suggested change

	echo __('You are viewing costs from the template. Save the project first to be able to add or modify costs.');
	echo __s('You are viewing costs from the template. Save the project first to be able to add or modify costs.');

[cedric-anne]

Suggested change

	echo __('You are viewing tasks from the template. Save the project first to be able to add or modify tasks.');
	echo __s('You are viewing tasks from the template. Save the project first to be able to add or modify tasks.');

[cedric-anne]

Suggested change

	echo __('You are viewing team members from the template. Save the project first to be able to add or modify team members.');
	echo __s('You are viewing team members from the template. Save the project first to be able to add or modify team members.');