Allow users to configure the container image used for init containers when creating a workspace

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Description

When creating a workspace, we use a container image(e.g. registry.gitlab.com/gitlab-org/workspaces/gitlab-workspaces-tools:9.0.0) to inject various tools inside the container where we want to start the IDE.

As a user(administrator), I want a way to configure this image to ensure Workspaces works properly is an isolated/offline environment.

Duplicate issues

• #507857 (comment 2452111825)
• Support workspace images to be pulled from priv... (#508162 - closed)

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