Backport of UI: Fix kubernetes auth method role management into release/1.14.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #25999 to be assessed for backporting due to the inclusion of the label backport/1.14.x.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
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The person who merged in the original PR is:
@hashishaw
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/vault/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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This PR reverts a regression introduced by #25364 which accidentally hid the roles tab in the kubernetes UI.

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Overview of commits

• 48e146c

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CI Results:
All Go tests succeeded! ✅