Fix: Fixup Gomplate rendering for 5.0.0 to 9-8-stable

What does this MR do?

Fix: Fixup Gomplate rendering for 5.0.0

Update gomplate template usages, to account
got function deprecation in 5.0.0

Changelog: fixed

This is a backport of !4809 (merged), which was already backported to 9-9-stable: !4846 (merged)

Related issues

• #6297 (closed)
• https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/team/-/work_items/11579
• gitlab-com/gl-infra/tenant-scale/cells-infrastructure/team#681 (closed)

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