Fix : Add remove trailing slash in transformStoryIndexToStoriesHash function

[sossost]

Closes #26642

What I did

There was a bug where the Explorer component crashed due to an exception being caught when the title of a story file ended with a slash.

If the last character of the title is a slash, logic has been added to remove it.

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Testing

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• stories
• unit tests
• integration tests
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Documentation

1. Run a sandbox for template, e.g. yarn task --task sandbox --start-from auto --template react-vite/default-ts
2. Open Storybook in your browser
3. Create a story file whose title ends with /.
4. Check whether the story is listed properly in the left sidebar of the storybook.

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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  • bug: Internal changes that fixes incorrect behavior.
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[valentinpalkovic]

@ndelangen This might be a duplicate of #26729 or vise versa.

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[sossost]

�hi @valentinpalkovic ! thank you
other work is code that recognizes input for trailing slashes as an error, falls back on the error, and does not render the component.
When I do not enter anything after / in the component title, an error occurs because the string following / cannot be found in the execution of JavaScript. Therefore, rather than displaying an error to provide a better user experience, I let the user I decided that it would be a good idea to execute the desired action.