Add new Elasticsearch E2E tests

What does this MR do?

Adds coverage for global search and advanced search syntax.

• Includes a new page object component and QA selectors.
• Updates the existing ES E2E test to indicate that it requires admin.
• Adds class method Runtime::API::Client.as_admin to make it easier to use the API as an admin.
• Adds the ability to use PUT via the API.

Closes gitlab-org/quality/testcases#122 (closed) and gitlab-org/quality/testcases#123 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers