feat(workspaces): toggle embedded viewer branding (#4762)

* feat(viewer): embedded viewer option to hide speckle branding

* chore(viewer): can edit embed options policy

* chore(embeds): tests for new policy and gql

packages/server/modules/workspacesCore/migrations/20250516130608_add_workspace_embed_options.ts

@@ -0,0 +1,13 @@
+import { Knex } from 'knex'
+
+export async function up(knex: Knex): Promise<void> {
+  await knex.schema.alterTable('workspaces', (table) => {
+    table.boolean('isEmbedSpeckleBrandingHidden').notNullable().defaultTo(false)
+  })
+}
+
+export async function down(knex: Knex): Promise<void> {
+  await knex.schema.alterTable('workspaces', (table) => {
+    table.dropColumn('isEmbedSpeckleBrandingHidden')
+  })
+}