Add CI check that links don't end in slash

[XanderG2]

Description

adds a test to check if internal links end in slashes, as slashes at the end of links break navigation.

Performance impact

N/A

Security impact

N/A

Checklist

• My code matches the project's code style and yarn lint:fix passes.
• I've added tests for the new feature, and yarn test passes.
• I have detailed the new feature in the relevant documentation.
• I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• If this is a breaking change I've explained why.

[changeset-bot]

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Latest commit: 4455d5d

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[benjie]

@jemgillam this looks good to me, but as you can see from the check being added to CI quite a lot of our links are already failing with it. I think you have work in progress to fix these, let's get that merged 👍

[benjie]

Excellent; thanks! 🙌