CTOR-2330 - fix qwinsta parsing

[s-duret]

Description

I fixed the column parsing to handle localized outputs (e.g., German).

Changes:
File: sessions.pm — replaced byte/position-based parsing with a more robust parser that splits on two-or-more spaces (with a whitespace fallback).

Why:
Byte/position parsing could fail with localized/multibyte headers (e.g., German characters).
The new parsing handles those cases better.

Fixes # CTOR-2330

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Functionality enhancement or optimization (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

Checklist

• I have followed the coding style guidelines provided by Centreon
• I have commented my code, especially hard-to-understand areas of the PR.
• I have rebased my development branch on the base branch (develop).