🌱 Updates conversion error message with reasoning

[JosephSalisbury]

What this PR does / why we need it:
Adds more context to error message about not being able to find versions matching contract - we burnt a few cycles with this error message, so I reckoned it'd be helpful to add a pointer for the next person :D

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[k8s-ci-robot]

Hi @JosephSalisbury. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[JosephSalisbury]

yo signed it

[JoelSpeed]

/ok-to-test
/lgtm

Seems like a useful update to me, thanks!

[fabriziopandini]

@JosephSalisbury welcome on Cluster API 🥳
/test pull-cluster-api-test-main

[JosephSalisbury]

/test pull-cluster-api-test-main

[JosephSalisbury]

/test pull-cluster-api-test-main

[vincepri]

/approve
/lgtm
/milestone v0.4.0

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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[JosephSalisbury]

thanks gang! 🎉

[vincepri]

@JosephSalisbury Do you want to cherry-pick this commit to the release-0.3 branch?

[JosephSalisbury]

Nah, v0.4.0 is fine with me, just wanted to get it in. All good.