feat(icons): added briefcase-plus icon (#4757)

* feat(icons): added `briefcase-plus` icon

* Update icons/briefcase-plus.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update icons/briefcase-plus.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update icons/briefcase-plus.json

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* chore(lab): remove `briefcase-plus` from lab

Icon has been promoted to icons/, no longer needed in lab.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* Updated briefcase-plus icon

* Update contributors in briefcase-plus.json

Added 'jguddas' to contributors list in briefcase-plus.json

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
Co-authored-by: Eric Fennis <eric.fennis@gmail.com>

lab/briefcase-plus.json

@@ -1,21 +0,0 @@
-{
-  "$schema": "../icon.schema.json",
-  "tags": [
-    "healthcare",
-    "first aid kit",
-    "paramedic",
-    "medkit",
-    "medikit",
-    "medpack",
-    "medicine",
-    "pharmacy",
-    "pharmaceutical",
-    "add",
-    "cross",
-    "box"
-  ],
-  "categories": [
-    "medical",
-    "gaming"
-  ]
-}

lab/briefcase-plus.svg

@@ -1,16 +0,0 @@
-<svg
-  xmlns="http://www.w3.org/2000/svg"
-  width="24"
-  height="24"
-  viewBox="0 0 24 24"
-  fill="none"
-  stroke="currentColor"
-  stroke-width="2"
-  stroke-linecap="round"
-  stroke-linejoin="round"
->
-  <path d="M8 7V5a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2" />
-  <rect width="20" height="14" x="2" y="7" rx="2" />
-  <path d="M15 14H9" />
-  <path d="M12 11v6" />
-</svg>