JS: Move babel-root-import test

This moves the test for the babel `root-import` plugin into the new
unit test for import resolution, so we only have one set of tests to
maintain.

The actual implementation is added in the next commit.

Author: asgerf

javascript/ql/test/library-tests/frameworks/babel/root-import/tst1/.babelrc.json renamed to javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/.babelrc.json

@@ -0,0 +1 @@
+import f from '~/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/frameworks/babel/root-import/tst1/a.js renamed to javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/a.js

@@ -0,0 +1 @@
+import f from '~/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/index.js

@@ -0,0 +1,2 @@
+import g from '~/b.js'; // $ MISSING: importTarget=BabelRootImport/tst2/src/js/b.js
+import f from '#/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/nested/tst.js

@@ -0,0 +1 @@
+import greeting from '~/b.js'; // $ MISSING: importTarget=BabelRootImport/tst3/src/b.js