fix(mr559): fixing reviewer failing test case

Summary

Following code modifications are done in the merge request

1. Code added in reviewers_invited.sql, role_names.json to include, information of new user Elaine Barnes having role of senior editor.
2. Included changes in review_spec.js for updating the user Elaine Barnes(Senior editor role), who confirms that 3 reviews for manuscript are complete.
3. Modified the review-page.js for fetching the accept radio button available in reviewers page.Also removed the cy.get call for fetching, href element as it was not required for test case execution.