Fix: ParticipatingOrganizations are now only top-level organizations

src/Migrations/Migrations.csproj

-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<OutputType>Library</OutputType>
 		<RootNamespace>Coscine.Migrations</RootNamespace>
@@ -30,6 +30,7 @@
 	  <None Remove="Migrations\Migration202205051431WormResourceType_up.sql" />
 	  <None Remove="Migrations\Migration202207191035GitlabResourceType_down.sql" />
 	  <None Remove="Migrations\Migration202207191035GitlabResourceType_up.sql" />
+	  <None Remove="Migrations\Migration202302271200TopLevelProjectOrganizations_up.sql" />
 	</ItemGroup>
 	
 	<ItemGroup>
@@ -55,6 +56,7 @@
 		<EmbeddedResource Include="Migrations\Migration202201241220TuDoResources_up.sql" />
 		<EmbeddedResource Include="Migrations\Migration202201190837NRWFHResources_down.sql" />
 		<EmbeddedResource Include="Migrations\Migration202201190837NRWFHResources_up.sql" />
+		<EmbeddedResource Include="Migrations\Migration202302271200TopLevelProjectOrganizations_up.sql" />
 	</ItemGroup>
 	
 	<ItemGroup>

src/Migrations/Migrations/Migration202302271200TopLevelProjectOrganizations.cs

+using FluentMigrator;
+
+namespace Coscine.Migrations.Migrations
+{
+    //yyyymmddhhmm
+    [Migration(202302271200)]
+    public class Migration202302271200TopLevelProjectOrganizations : Migration
+    {
+        public override void Up()
+        {
+            Execute.EmbeddedScript("Migration202302271200TopLevelProjectOrganizations_up.sql");
+        }
+        public override void Down()
+        {
+            // I've added no down script since the change itself has no correct reversal.
+        }
+    }
+}
\ No newline at end of file

src/Migrations/Migrations/Migration202302271200TopLevelProjectOrganizations_up.sql

+UPDATE ProjectInstitute
+SET OrganizationUrl = LEFT(OrganizationUrl, CHARINDEX('#', OrganizationUrl + '#') - 1);
\ No newline at end of file