Add flow extension management UI for connections

[KD23243]

Purpose

Introduce the front-end for managing flow extensions from the connections area, along with the shared flow-context-tree component and supporting translations. This is a pruned slice of the in-flow extension work — the flow-builder packages, JSP portal changes, and react-ui-core changes are merged separately and are intentionally excluded here.

Implementation

• admin.connections.v1: new flow extension create wizard, edit page, and edit settings (general, endpoint, access config, custom errors), translation hook, utils, template group metadata, and icon; wired into the authenticator/connection create factories, templates, and UI configs.
• common.ui.shared-access.v1: new reusable flow-context-tree component (tree, node, add-claim and add-entry modals, models, utils).
• admin.actions.v1: endpoint config form updates shared with the flow extension endpoint settings.
• admin.core.v1 / admin.feature-gate.v1: config reducer and feature flag entries.
• modules/i18n: flow extension namespace interface and English translations (extends the entries already present on master).
• modules/react-components / modules/theme: resource grid card adjustment and identity-provider icon asset.
• apps/console: route registration, deployment config entry, and connection logo asset.

Dependency manifest changes (package.json, pnpm-lock.yaml) are intentionally omitted and will be regenerated separately.

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