GHA: Migrate semgrep action to centralised workflow (#3543)

* GHA: Migrate semgrep action to centralised workflow

* Test GHA

* Fix job name

* Remove secrets

* Test Mac Fix

* GHA Test

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Co-authored-by: Martijn Verburg <martijnverburg@gmail.com>

.github/workflows/semgrep_diff.yml

@@ -5,19 +5,4 @@ on:
 
 jobs:
   semgrep-diff:
-    runs-on: ubuntu-latest
-    container:
-      image: returntocorp/semgrep
-
-    steps:
-      # Step 1: Clone application source code
-      - name: Checkout code
-        uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
-        with:
-          fetch-depth: 0
-
-      # Step 2: Differential scan
-      - name: Differential scan
-        run: |
-          semgrep ci \
-            --config="p/trailofbits"
+    uses: adoptium/.github/.github/workflows/semgrep_diff.yml@main