CSF: Fix auto-title generation for standard config dir

[shilman]

Issue: N/A

What I did

The previous auto-title PR #15376 failed for a typical Storybook setup in which the configDir is different from the current working directory. I didn't catch it because my test case was examples/react-ts which is a corner case where the configDir IS the current directory.

To address this:

• Added logic to rewrite the directory specifier to match webpack's fileName
• Added a unit test
• Added a new example, examples/cra-ts-kitchen-sink, which uses the typical config structure

self-merging @tmeasday

How to test

See attached tests

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