Refactor trailing comma comment adjustment (#10380)

* Refactor trailing comment adjustment

Following up from https://github.com/babel/babel/pull/10369

- Unify the logic for adjusting trailing comments into a separate
  function
- Use it for all three cases, which fixes a bug for ObjectExpressions
  and CallExpressions
- Update tests to check for the fixed bug

* Fix tests

- Only modify trailingComments if necessary
- Update snapshots of a couple of affected tests

* Drop the underscore in adjustCommentsAfterTrailingComma_

* Handle ArrayPattern

* Handle ObjectPattern

* Handle import and export declarations

These have to be handled a bit differently, because the  node is visited after the  and before the declaration. So we intercept when we are going from the last specifier to the source node.

* Remove unnecessary check

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

@@ -1 +1 @@
-fn(a, b, /* comment */);
+fn(a, b, /* comment 1 */) /* comment 2*/;