Enable ORM v2 read path by default on new workspaces (#24682)

## What

Adds `IS_ORM_V2_READ_PATH_ENABLED` to `DEFAULT_FEATURE_FLAGS`, so every
newly created workspace gets the new ORM read path enabled on
activation.

## Why

Rolls out the new ORM to fresh workspaces without touching existing
ones. New workspaces start on the new read path from day one, while
existing workspaces are unaffected and continue to be migrated
separately.

## Scope

- Only the default flag set for new workspace activation changes.
- Existing workspaces are not modified.

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