Core: Fix builder-manager adding multiple dashes to relative path

[MarioCadenas]

Closes #

What I did

When building a standalone storybook, using the function buildStaticStandalone and having a manager.ts inside the main configDir of storybook, the folder generated inside the storybook/sb-addons that contains the manager bundle in some cases might get into the function sanitizeBase as a relative path, example

../../my-module/some-path/foo/bar
and after getting the result from sanitizeBase it would be

--my-module-some-path-foo-bar

The problem with this is that uploading a folder like this to S3 makes it a problem and is not accessible. So this PR basically removes the dashes in case they exist. So in the previous example it would return

my-module-some-path-foo-bar

How to test

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[ndelangen]

Thank you @MarioCadenas !

[MarioCadenas]

Thank you @MarioCadenas !

A pleasure! thanks for the fast review! 😄