refactor: source ewFlags from nx2

[kozmaadrian]

What

Removes the local blocks/shared/ewFlags.js and sources EW flags from nx2 instead
(adobe/da-nx#), via a new getNx2EwFlags() loader in scripts/utils.js
(mirrors getNx2Api).

Why

The flag logic is common to Nexter consumers, so it lives in nx2 now. Keeping a
duplicate copy here would drift.

Changes

• scripts/utils.js: add getNx2EwFlags().
• canvas/utils/panel.js, canvas/utils/view.js: take the flags loader as an
  injected dependency (defaults to nx2), so the consumers stay unit-testable
  without the nx2 runtime.
• browse/da-browse, canvas/ew-canvas-header: load isEWEnabled /
  isEwChatDisabled from nx2.
• Deletes blocks/shared/ewFlags.js and its test.

Notes

• Depends on (feat(nx2): add ewFlags util (moved from da-live) da-nx#545 — merge that first.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

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.

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Commits

• 9d0a8b4 ✅ (latest)

[kozmaadrian]

Closing in favour of #1041 (using a shorter branch name)