refactor(NODE-6795): move libmongocrypt helpers to etc

Author: axelonet

.github/scripts/get-commit-from-ref.sh

@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Build ${{ matrix.os }} Prebuild
-        run: node .github/scripts/libmongocrypt.mjs ${{ runner.os == 'Windows' && '--build' || '' }}
+        run: node etc/libmongocrypt.mjs ${{ runner.os == 'Windows' && '--build' || '' }}
         shell: bash
 
       - id: upload
@@ -102,4 +102,4 @@ jobs:
           path: prebuilds/
           if-no-files-found: "error"
           retention-days: 1
-          compression-level: 0
+          compression-level: 0