(#125) Fix overall code coverage

[seyilonge-nci]

(#125) Fix overall code coverage](https://github.com/NCIOCPL/sitewide-search-app/pull/159/commits/451534b44220ab48d2ed0671fa62999e00109fd6)

• Added pre-merge script to setup combined coverage directories and copy coverage files from cypress and jest.
• Added merged coverage specific config, as the nyc section in package.json is used by cypress.
• Added text reporting after ALL integration tests finish. When text reporting is enabled Cypress reports after each feature.
• Added reporting for full merged coverage at the end with coverage checking set to 80%.
• Boosted coverage to 82%
• Removed polyfill for ie11
• Updated config for istanbul plugin (removed from babel.config.js, added to webpack.config.js for non-PROD env)

Closes https://github.com/NCIOCPL/sitewide-search-app/issues/125

(#125) Linter Fixes for code coverage update](https://github.com/NCIOCPL/sitewide-search-app/pull/159/commits/cc61fae5ac3aa3e37f7e6914f07a20a089bba2e7)

• Ran npm run format to fix linting issues
• Removed unused variables noted in linter log

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