chore(common): ensure test and coverage files are not included in npm pack/publish

[mcdurdin]

e.g. the following are included when Server's test is done before pack/publish:

C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\helpers
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\test-license.d.ts
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\test-license.d.ts.map
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\test-license.js
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\test-license.js.map
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\tsconfig.tsbuildinfo
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\helpers\index.d.ts
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\helpers\index.d.ts.map
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\helpers\index.js
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test\helpers\index.js.map
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov.info
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\base.css
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\block-navigation.js
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\favicon.png
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\index.html
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\prettify.css
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\prettify.js
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\sort-arrow-sprite.png
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\sorter.js
C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\coverage\lcov-report\validate-mit-license.ts.html

C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\.nyc_output\coverage-15680-1715409764586-0.json

C:\Program Files (x86)\Keyman\Keyman Developer\Server\node_modules\@keymanapp\developer-utils\build\test