Fix issue #14993 about forward slashes not working on windows when globbing sources

[DavidVilleneuveAnsys]

🐛: Using a list of allowed separators (alternate + normal) to search for instead of only using the main separators

Description

To retrieve the source where we start the globbing pattern, the pattern is first split, then we search for the first Directory separator.

In this search, we only allow for the the principal separator, however, some platforms have alternate separators.

So we use LastIndexOfAny instead of LastIndexOf

Related issue

Issue being fixed is here #14993 and is flagged as a bug

• I have ensured that there is a previously discussed and approved issue.

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