test: cover products staking pool fork tests

[MilGard91]

Context

The fork tests are missing tests for stored values of Staking Pools before and after upgrade

Changes proposed in this pull request

Add tests for staking pools in fork tests

Test plan

Please describe the tests cases that you ran to verify your changes. Add further instructions on
how to run them if needed (i.e. migration / deployment scripts, env vars, etc).

Checklist

• Rebased the base branch
• Attached corresponding Github issue
• Prefixed the name with the type of change (i.e. feat, chore, test)
• Performed a self-review of my own code
• Followed the style guidelines of this project
• Made corresponding changes to the documentation
• Didn't generate new warnings
• Didn't generate failures on existing tests
• Added tests that prove my fix is effective or that my feature works

Review

When reviewing a PR, please indicate intention in comments using the following emojis:

• 🍰 = Nice to have but not essential.
• 💡 = Suggestion or a comment based on personal opinion
• 🔨 = I believe this should be changed.
• 🤔 = I don’t understand something, do you mind giving me more context?
• 🚀 = Feedback