Remove IS_NATIVE_CALL_RECORDING_TABS_ENABLED feature flag (#24765)

## What

Native call recording tabs are now always on. This removes the
`IS_NATIVE_CALL_RECORDING_TABS_ENABLED` feature flag and the tab
filtering that gated on it, following the pattern of earlier flag
removals (#24692, #22680, #21323).

## Changes

- Removed the flag from `FeatureFlagKey` in `twenty-shared` and from the
generated GraphQL enums (`twenty-front` metadata/admin schemas,
`twenty-client-sdk`).
- Deleted `filterPageLayoutTabsByFeatureFlags` (and its test) and the
`usePageLayoutTabsFilteredByFeatureFlags` hook: with the flag gone they
were pure pass-throughs. Their consumers (`usePageLayoutRenderableTabs`,
`usePageLayoutTabWithVisibleWidgetsOrThrow`,
`usePageLayoutAddTabStrategy`, `PageLayoutSingleTabRenderer`,
`PageLayoutTabListNewTabDropdownContent`) now read
`currentPageLayout.tabs` directly.
- Updated the `usePageLayoutRenderableTabs` test to provide tabs through
the `useCurrentPageLayoutOrThrow` mock instead of the deleted hook.

## Notes

- The flag was never registered in the server's `DEFAULT_FEATURE_FLAGS`,
public feature flags, or dev seeds, so no server change or upgrade
command is needed. `featureFlag.key` is a text column, so existing rows
for this key are inert.
- Verified with `twenty-front` typecheck, `lint:diff-with-main`, and the
page-layout jest suites (1318 tests passing).

---
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