Core: Fix issue with recursive glob with prior special chars

[tmeasday]

Issue: #17038, #16964, #16924

In all three cases the issue is special glob patterns before the ** in the glob.

In 6.4, we incorrectly changed the condition for a recursive look up to be the files glob had to start with **, which is broken in the above cases.

What I did

This goes back to the old condition (recursive if the glob contains '**' or '/' -- I suspect just the latter would be enough). Plus add a fix for our normalisation of directory names when they are just '..' or '.'

How to test

See tests. You can also create a reproduction SB with one of the following stories fields:

module.exports = {
  stories: [
    
    // https://github.com/storybookjs/storybook/issues/17038
    // '../sr*/**/*.stories.@(js|jsx|ts|tsx)',

    // https://github.com/storybookjs/storybook/issues/16964
    // '../!(foo)/**/*.stories.@(js|jsx|ts|tsx)',

    // https://github.com/storybookjs/storybook/issues/16924
    '../{src,random}/**/*.stories.@(js|jsx|ts|tsx)',
  ],

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[shilman]

LGTM! 💯