E2E Fixing the variable failures in workspace spec

What does this MR do?

Fixing the browser_ui/3_create/remote_development/workspace_actions_spec.rb by enclosing the variables as aruguments for the helm command. Tested locally

E2E Test Failure issue(s)

#433977 (closed)

How to set up and validate locally

The full list of variable and their values to run this spec can be found in 1password "Run workspaces tests against staging"

bundle exec bin/qa Test::Instance::All https://staging.gitlab.com -- -- qa/specs/features/ee/browser_ui/3_create/remote_development/workspace_actions_spec.rb

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #433977 (closed)