Backport of ensure actions don't break the graph in modules with no instances into v1.14

[github-actions]

Backport

This PR is auto-generated from #38089 to be assessed for backporting due to the inclusion of the label 1.14-backport.

The below text is copied from the body of the original PR.

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Before we only added the root graph node on each module iteration, but we want the root node to always be present in the sub-graph so we moved this call to just before the return statement.

Fixes #38088

Target Release

1.15.x

Rollback Plan

• If a change needs to be reverted, we will roll out an update to the code within 7 days.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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Overview of commits

• 62cb10d

• 500a822

[github-actions]

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