Merge branch 'ajwalker/pwsh-arm64' into 'main'

Add ubuntu arm64 pwsh runner helper image

Closes #38386

See merge request gitlab-org/gitlab-runner!5512



Merged-by: Georgi N. Georgiev <ggeorgiev@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Co-authored-by: Arran Walker <ajwalker@gitlab.com>