Migrate QA Access Token page object attributes to data-testid

What does this MR do and why?

Migrates QA Access Token and SSH key page object attributes from data-qa-selector to data-testid

As per gitlab-org/quality/quality-engineering/team-tasks#1822 (closed)

How to set up and validate locally

Any test where we initially set up an access token - note ensure that an access token is not set in environment variables.

CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All http://gdk.test:3000/ ./qa/specs/features/browser_ui/4_verify/runner/register_runner_spec.rb

CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All http://gdk.test:3000/ ./qa/specs/features/browser_ui/3_create/repository/push_over_ssh_spec.rb

MR acceptance checklist

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