chore: add a knuu getter

[mojtaba-esk]

While attempting to use testnet pkg in the node repo. There is a need to use knuu object that is initialized by the testnet.New() to create new instances and interact with knuu. Since it is not exported, this PR proposed to have a getter func for it, so users can interact with knuu easily.

[coderabbitai[bot]]

:memo: Walkthrough

## Walkthrough A new method named `Knuu` has been introduced to the `Testnet` struct in the `test/e2e/testnet/testnet.go` file. This method provides external access to the `knuu` field of the `Testnet` struct, which was previously inaccessible. No other modifications to the logic or control flow have been made in this pull request. ## Changes | File Path | Change Summary | |------------------------------------|---------------------------------------------------------| | test/e2e/testnet/testnet.go | Added method `Knuu` to `Testnet` struct for accessing the `knuu` field. | ## Possibly related PRs - #3873: Involves significant modifications to the `Testnet` struct in `test/e2e/testnet/testnet.go`, including the integration of the `knuu` package, which relates to the addition of the `Knuu` method. ## Suggested reviewers - staheri14 - ninabarbakadze - rootulp - cmwaters

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[mojtaba-esk]

It's probably cleaner to pass the *knuu.Knuu struct to the testnet constructor but this is also fine

Thanks for the feedback. yes that could make it better. Most parts of the e2e could be refactored as for example I see a number of funcs have too many arguments which we could use options instead.