fix: handle section metadata for live preview, quick-edit and experience workspace

[usman-khalid]

Description

Section metadata is not being applied in DA's built-in live preview, Quick Edit and the Experience Workspace layout mode for sites that don't have client-side section-metadata processing, regardless of whether server side processing via helix-html-pipeline is auto-enabled (site created after May 1st, 2026) or via feature flag features.rendering.version: 2. All three generate their preview HTML via prose2aem, so we need to handle it there.

How Has This Been Tested?

Tested on https://sm-fix--da-live--usman-khalid.aem.page/ and directly on da.live with browser overrides for all three cases (quick-edit, EW, DA live preview)

Screenshots (if appropriate):

Before (EW):

After:

Also removes section-metadata from the page outline right rail in experience workspace as it's not a real block.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mhaack]

Suggest to have this rendered directly in HTML like pipeline, see adobe/da-universal#222