IBX-6875: Implemented IsPreview View Matcher

[alongosz]

Question	Answer
JIRA issue	IBX-6875
Required by	ibexa/dashboard#26
Type	feature
Target Ibexa version	v4.6
BC breaks	no

This PR proposes IsPreview View Matcher allowing to distinguish templates for the same view type and SiteAccess but preview or non-preview view. Alternatively this can be achieved by either creating separate view type or using Twig "ifs" like {% if parameters.editorial_mode %} (PB) or {% if isPreview %} (Core).

Consider the following configuration:

ibexa:
  system:
    default:
      content_view:
        full:
          my_view:
            template: '@ibexadesign/app/my_view.html.twig'
            match:
              Identifier\ContentType: [ my_content_type ]
              IsPreview: false

          my_preview:
            template: '@ibexadesign/app/my_preview.html.twig'
            match:
              Identifier\ContentType: [ my_content_type ]
              IsPreview: true

When viewing a content of my_content_type content type my_view.html.twig template would be used. When previewing that content my_preview.html.twig would be used. Tested with ibexa/dashboard feature but that could work with core preview feature as well and maybe provide value overall.

Review remark: magic - this is legacy namespace-based view matcher - it's dynamically created as long as this class exists in that namespace...

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly (main).
• Ran PHP CS Fixer for new PHP code (use $ composer fix-cs).
• Asked for a review.

[sonarqubecloud]

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[alongosz]

Merging to unblock ibexa/dashboard. Will be tested together with the Customizable Dashboard feature.