Retain trailing comments in array expressions (#10369)

* Retain trailing comments in array expressions

This is a proposed fix for https://github.com/babel/babel/issues/10368
with a simple test.

* Move lastElement in the block where it's used

* Test trailing comment after array expression

* Don't move comments after the array expression

* Retain trailing comment after the array expression

packages/babel-parser/test/fixtures/comments/basic/array-expression-trailing-comma/input.js

@@ -0,0 +1,18 @@
+const nonTrailing = [
+  "One", // One
+   // Two
+  "Two" // Three
+  // Four
+]
+
+const trailingAfterComma = [
+  "One", // One
+   // Two
+  "Two", // Three
+  // Four
+]
+
+const trailingAfterArray = [
+  "One", // One
+   // Two
+] // Three