Combine solution injection systems; Fix embeddable injectors (#26268)

* Combine injection systems

* Update Content.Server/Chemistry/EntitySystems/SolutionInjectOnEventSystem.cs

---------

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Chemistry/Components/BaseSolutionInjectOnEventComponent.cs

@@ -0,0 +1,60 @@
+using Content.Shared.FixedPoint;
+using Content.Shared.Inventory;
+
+namespace Content.Server.Chemistry.Components;
+
+/// <summary>
+/// Base class for components that inject a solution into a target's bloodstream in response to an event.
+/// </summary>
+public abstract partial class BaseSolutionInjectOnEventComponent : Component
+{
+    /// <summary>
+    /// How much solution to remove from this entity per target when transferring.
+    /// </summary>
+    /// <remarks>
+    /// Note that this amount is per target, so the total amount removed will be
+    /// multiplied by the number of targets hit.
+    /// </remarks>
+    [DataField]
+    public FixedPoint2 TransferAmount = FixedPoint2.New(1);
+
+    [ViewVariables(VVAccess.ReadWrite)]
+    public float TransferEfficiency { get => _transferEfficiency; set => _transferEfficiency = Math.Clamp(value, 0, 1); }
+
+    /// <summary>
+    /// Proportion of the <see cref="TransferAmount"/> that will actually be injected
+    /// into the target's bloodstream. The rest is lost.
+    /// 0 means none of the transferred solution will enter the bloodstream.
+    /// 1 means the entire amount will enter the bloodstream.
+    /// </summary>
+    [DataField("transferEfficiency")]
+    private float _transferEfficiency = 1f;
+
+    /// <summary>
+    /// Solution to inject from.
+    /// </summary>
+    [DataField]
+    public string Solution = "default";
+
+    /// <summary>
+    /// Whether this will inject through hardsuits or not.
+    /// </summary>
+    [DataField]
+    public bool PierceArmor = true;
+
+    /// <summary>
+    /// Contents of popup message to display to the attacker when injection
+    /// fails due to the target wearing a hardsuit.
+    /// </summary>
+    /// <remarks>
+    /// Passed values: $weapon and $target
+    /// </remarks>
+    [DataField]
+    public LocId BlockedByHardsuitPopupMessage = "melee-inject-failed-hardsuit";
+
+    /// <summary>
+    /// If anything covers any of these slots then the injection fails.
+    /// </summary>
+    [DataField]
+    public SlotFlags BlockSlots = SlotFlags.NONE;
+}