Fix 'Hypopen shouldn't display solution examine text' (#26453)

* stealthy hypo

* ExaminableSolution hand check when in covert implement.

ExaminableSolution now has 'hidden' datafield to enable chemical inspection only in hand.

* cleaning code

* more cleaning

* Hidden datafield renamed to HeldOnly

* review

---------

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Chemistry/Components/SolutionManager/ExaminableSolutionComponent.cs

@@ -5,4 +5,10 @@ public sealed partial class ExaminableSolutionComponent : Component
 {
     [DataField, ViewVariables(VVAccess.ReadWrite)]
     public string Solution = "default";
+
+    /// <summary>
+    /// If false then the hidden solution is always visible.
+    /// </summary>
+    [DataField]
+    public bool HeldOnly;
 }