Apply suggestions from code review

Co-authored-by: Luke Cartey <5377966+lcartey@users.noreply.github.com>

Author: rak3-sh

change_notes/2023-07-26-unused-local-variable.md

@@ -1 +1 @@
- - Consider constexpr variables used in template instantiations as "used".
+ - `M0-1-3` - Consider constexpr variables used in template instantiations as "used".

cpp/autosar/src/rules/M0-1-3/UnusedLocalVariable.ql

@@ -30,7 +30,7 @@ private string getConstExprValue(Variable v) {
 // - getUseCount()
 int getUseCountConservatively(Variable v) {
   result =
-        count(VariableAccess access | access = v.getAnAccess() and not access.isCompilerGenerated())
+        count(VariableAccess access | access = v.getAnAccess())
         + count(UserProvidedConstructorFieldInit cfi | cfi.getTarget() = v) +
         // For constexpr variables used as template arguments, we don't see accesses (just the
         // appropriate literals). We therefore take a conservative approach and count the number of