harmonized and removed typos in prompts in testset generation

[MoritzLaurer]

this pull requests harmonises prompt formatting and makes minor improvements (e.g. removal of typos) in the prompt templates for testset generation

[shahules786]

Hi @MoritzLaurer , Apologies for the delay in responding here. Thank you for your effort, but we are refactoring test generation as indicated RFC, So we won't be able to merge this now. But I could use your ideas and suggestions while we redo the prompts.
I would really appreciate if you can provide any suggestions in RFC

[MoritzLaurer]

Ok, no problem, great that you are refactoring testset generation

[jjmachan]

we have a much improved Testset Generation now @MoritzLaurer, did you get a chance to try it out?
closing this for now but I'm really sorry we couldn't merge it 🙁 but at the same time thanks a million for taking the time to raise this, really grateful too and do checkout this form https://docs.google.com/forms/d/e/1FAIpQLSdM9FrrZrnpByG4XxuTbcAB-zn-Z7i_a7CsMkgBVOWQjRJckg/viewform - our way of saying thank you 🙂