feat: hide tokens tab

[r4mmer]

Acceptance Criteria

• Only show tokens tab if at least one of its options are enabled

Motivation

All items under the tokens tab are protected behind an unleash feature flag, but if all feature flags are disabled the UI would show an empty dropdown

To prevent this, we need to remove the tokens tab altogether when all feature flags are disabled.

For reference, when all items are enabled we have this:

Alternatives

Ideally we should have a component to conditionally render the tab, but using unleash's useFlag on callbacks and not on the component body directly would fail building the explorer.

Later we can refactor this with a custom hook to check multiple flags, but since this is the only instance where this behavior is required we can use conditional rendering without any code repetition.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.