Add Next button to tab, fixes #14520

[SamDecrock]

Summary

Fixes #14520
Just adds a button called Next to the tabs. A small change to greatly improve UX.

Occurred changes and/or fixed issues

None

Technical notes summary

Just added a button.

Areas or cases that should be tested

Installing a new Helm App

Areas which could experience regressions

IDK

Screenshot/Video

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After:

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
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[richard-cox]

Thanks for creating this PR. I added more detail in #14520 (comment) but basically we'll get our UX team to review. They will consider how this works not only in wizards but also elsewhere tabs are used