[PM-21918] update send api models to support new email field (#5895)

* update send api models to support new `email` field

* normalize authentication field evaluation order

* document send response converters

* add FIXME to remove unused constructor argument

* add FIXME to remove unused constructor argument

* introduce `tools-send-email-otp-listing` feature flag

* add `ISendOwnerQuery` to dependency graph

* fix broken tests

* added AuthType prop to send related models with test coverage and debt cleanup

* dotnet format

* add migrations

* dotnet format

* make SendsController null safe (tech debt)

* add AuthType col to Sends table, change Emails col length to 4000, and run migrations

* dotnet format

* update SPs to expect AuthType

* include SP updates in migrations

* remove migrations not intended for merge

* Revert "remove migrations not intended for merge"

This reverts commit 7df56e346a.

undo migrations removal

* extract AuthType inference to util method and remove SQLite file

* fix lints

* address review comments

* fix incorrect assignment and adopt SQL conventions

* fix column assignment order in Send_Update.sql

* remove space added to email list

* assign SQL default value of NULL to AuthType

* update SPs to match migration changes

---------

Co-authored-by: Daniel James Smith <2670567+djsmith85@users.noreply.github.com>
Co-authored-by: Alex Dragovich <46065570+itsadrago@users.noreply.github.com>
Co-authored-by: John Harrington <84741727+harr1424@users.noreply.github.com>

util/SqliteMigrations/Migrations/20251217190836_AddAuthTypeToSend.cs

@@ -0,0 +1,27 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Bit.SqliteMigrations.Migrations;
+
+/// <inheritdoc />
+public partial class AddAuthTypeToSend : Migration
+{
+    /// <inheritdoc />
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.AddColumn<byte>(
+            name: "AuthType",
+            table: "Send",
+            type: "INTEGER",
+            nullable: true);
+    }
+
+    /// <inheritdoc />
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.DropColumn(
+            name: "AuthType",
+            table: "Send");
+    }
+}

util/SqliteMigrations/Migrations/20251218153206_SendAuthTypeAndEmailLength.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Bit.SqliteMigrations.Migrations;
+
+/// <inheritdoc />
+public partial class SendAuthTypeAndEmailLength : Migration
+{
+    /// <inheritdoc />
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+
+    }
+
+    /// <inheritdoc />
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+
+    }
+}

util/SqliteMigrations/Migrations/DatabaseContextModelSnapshot.cs

@@ -1621,6 +1621,9 @@ namespace Bit.SqliteMigrations.Migrations
                     b.Property<int>("AccessCount")
                         .HasColumnType("INTEGER");
 
+                    b.Property<byte?>("AuthType")
+                        .HasColumnType("INTEGER");
+
                     b.Property<Guid?>("CipherId")
                         .HasColumnType("TEXT");
 
@@ -1637,7 +1640,7 @@ namespace Bit.SqliteMigrations.Migrations
                         .HasColumnType("INTEGER");
 
                     b.Property<string>("Emails")
-                        .HasMaxLength(1024)
+                        .HasMaxLength(4000)
                         .HasColumnType("TEXT");
 
                     b.Property<DateTime?>("ExpirationDate")