chore/renderer-test

[RobertGHippo]

Description

A new unit test to check that the InsetTextRenderer creates a div with the correct class.

How Has This Been Tested?

It's just a single additional unit test.

Checklist:

• My code follows the standards used within this project
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests (Unit, E2E) that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

Package	Line Rate	Branch Rate	Health
Dfe.EarlyYearsQualification.Web	98%	91%	✔
Dfe.EarlyYearsQualification.Content	85%	87%	❌
Dfe.EarlyYearsQualification.Mock	100%	100%	✔
Summary	94% (1692 / 1804)	90% (222 / 248)	✔

Minimum allowed line rate is 90%