Add script to fix dotnet lockfiles (Azure#8954)

scripts/fix_dotnet_lockfiles.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+
+usage="Usage: ./scripts/fix_dotnet_lockfiles.sh <pr_id>"
+prId=${1:?"Missing PR id. ${usage}"}
+
+gh pr checkout $prId
+if [ -n "$(git status --porcelain)" ]; then
+  echo "Found unexpected changes in git working directory, aborting."
+  exit 1
+fi
+
+dotnet restore --force-evaluate
+git commit -a -m "Fix dotnet lockfiles"
+git push
+
+branchName=$(git rev-parse --abbrev-ref HEAD)
+git checkout main
+git branch -D $branchName