E2E test: fix protected tag spec

What does this MR do and why?

Fixes reliable test failure: #421062 (closed) which started failing with !128281 (merged)

Failure seems to be from small UI adjustments.

• needing to click Add tag to add a tag
• role dropdown covering the Protect button

How to set up and validate locally

bundle exec rspec qa/specs/features/browser_ui/3_create/repository/protected_tags_spec.rb

MR acceptance checklist

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