Navbar customization improvements (#17863)

- Add folder icon editing support
- And other navbar customization fixes/improvements.

---------

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>
Co-authored-by: Devessier <baptiste@devessier.fr>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/metadata-modules/flat-entity/constant/__tests__/__snapshots__/all-universal-flat-entity-properties-to-compare-and-stringify.constant.spec.ts.snap

@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+// Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`ALL_UNIVERSAL_FLAT_ENTITY_PROPERTIES_TO_COMPARE_AND_STRINGIFY should match snapshot 1`] = `
 {
@@ -103,6 +103,7 @@ exports[`ALL_UNIVERSAL_FLAT_ENTITY_PROPERTIES_TO_COMPARE_AND_STRINGIFY should ma
       "folderUniversalIdentifier",
       "name",
       "link",
+      "icon",
     ],
     "propertiesToStringify": [],
   },

packages/twenty-server/src/engine/metadata-modules/flat-entity/constant/all-entity-properties-configuration-by-metadata-name.constant.ts

@@ -1019,6 +1019,7 @@ export const ALL_ENTITY_PROPERTIES_CONFIGURATION_BY_METADATA_NAME = {
     },
     name: { toCompare: true, toStringify: false, universalProperty: undefined },
     link: { toCompare: true, toStringify: false, universalProperty: undefined },
+    icon: { toCompare: true, toStringify: false, universalProperty: undefined },
     createdAt: {
       toCompare: false,
       toStringify: false,