filter-invalid-actions: Log 'skipping action' as 'verbose'

Rather than as 'warn'. This is papering over a deeper issue which
will be resolved by making symlinks entirely opaque.

Fixes: #9999
Credit: @timoxley
Reviewed-By: @iarna
PR-URL: #13613

Author: timoxley

lib/install/filter-invalid-actions.js

@@ -24,7 +24,7 @@ module.exports = function (top, differences, next) {
     if (pkg.isInLink || (pkg.parent && (pkg.parent.target || pkg.parent.isLink))) {
       // we want to skip warning if this is a child of another module that we're removing
       if (!pkg.parent.removing) {
-        log.warn('skippingAction', 'Module is inside a symlinked module: not running ' +
+        log.verbose('skippingAction', 'Module is inside a symlinked module: not running ' +
           cmd + ' ' + packageId(pkg) + ' ' + path.relative(top, pkg.path))
       }
     } else {