Fix PowerShell variable expansion in Windows release scripts

What does this MR do and why?

Fix PowerShell variable expansion in Windows release scripts

The GitLab Runner was prematurely expanding PowerShell variables (e.g., $env:CI_JOB_TOKEN, $glabVersionOutput) before they reached the PowerShell interpreter, causing syntax errors (https://gitlab.com/furkanayhan/test-project/-/jobs/10340950594).

This change escapes all PowerShell variables with $$ to prevent the runner from interpreting them as shell variables, ensuring they are passed through to PowerShell intact.

References

Jobs with release keyword fail on Windows with ... (cli#7882 - closed)

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