Cherrypicks 5 (#440)

* Chances of triggering effects (#27056)

* electrocution

* slippery

* flashibg

* Update SlipperyComponent.cs

* Update SlipperySystem.cs

* Flash buff (#25730)

* flash buff

* oops!

* bool

* 3 -> 1.5 seconds

* okay fix

* sluth

* Flash overlay rework and bugfixes (#27369)

* fix mapping door access (#27784)

Co-authored-by: deltanedas <@deltanedas:kde.org>

* - fix: Errors.

* - fix: Incorporeal.

---------

Co-authored-by: Ed <96445749+TheShuEd@users.noreply.github.com>
Co-authored-by: Nemanja <98561806+EmoGarbage404@users.noreply.github.com>
Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>
Co-authored-by: deltanedas <39013340+deltanedas@users.noreply.github.com>

Content.Server/Electrocution/Components/ElectrifiedComponent.cs

@@ -92,4 +92,7 @@ public sealed partial class ElectrifiedComponent : Component
 
     public EntityUid? Caster;
     // WD EDIT END
+
+    [DataField]
+    public float Probability = 1f;
 }