Update 'Install all paid plugins at once' functionality and remove license key mgmt from Marketplace

[michalkleiner]

Description

Changes done:

• Remove license key management from Marketplace as this can be managed via settings.
• Adjust styling for marketplace heading to prevent jumping of content on hover.
• Update "Install all paid plugins at once" (IAPPAO) to fetch data from the controller to avoid a page refresh and be up to date.
• Show plugin display names in update modal (instead of plugin names).
• Simplify intro text for super users and non-super users as agreed on in JIRA.
• Use pure CSS Matomo loader in the install button (discussed with design team). Already merged for reuse in 22240 🎉.
• Limit width of the whole marketplace to 1300px similar to how it's done in the admin section as e.g. the install action takes the user from the dashboard marketplace to the admin marketplace and the UX would be inconsistent. This has been mentioned by product in the past and this ticket was a good candidate to adjust that.

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed