fix(curriculum): Merge similar steps with improved tests

[zxc-w]

Checklist:

• I have read and followed the contribution guidelines.
• I have read and followed the how to open a pull request guide.
• My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or GitPod.

Closes #54912

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I added one more test case for the second task of each step, as with the original one before merging them, it will accept this:

I did it with regex, I tried doing it with a similar way to the first task but it seems that multiple </div> after it is a little confusing for the test.
I tried many other ways and the regex is the only one that worked for me.

Let me know if there is anything I did wrong or can be done in a better way.

[camperbot]

We would love to be able to merge your changes, but it looks like you have some merge conflicts. ⚠️

Once you resolve these conflicts, we will be able to review you rPR and merge it. 😊

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If you're not familiar with the merge conflict process, feel free to look over GitHub's guide on "Resolving a merge conflict". 🔍️

Also, it's good practice on GitHub to write a brief description of your changes when creating a PR. 📝

[naomi-lgbt]

Thanks for your interest in contributing! We have accepted an earlier contribution which resolves the same issue. Please don't feel discouraged - we look forward to seeing future contributions from you. 💜