enh(composer): reduce size of centreon package on packagist (#7818)

.gitattributes

@@ -0,0 +1,24 @@
+/.github export-ignore
+/doc export-ignore
+/features export-ignore
+/project export-ignore
+/tests export-ignore
+/.babelrc export-ignore
+/.csslintrc export-ignore
+/.eslintignore export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.prettierrc.js export-ignore
+/.project export-ignore
+/behat.yml export-ignore
+/build.xml export-ignore
+/centreon-github-wall.jpg export-ignore
+/CHANGELOG export-ignore
+/CODE_OF_CONDUCT.md export-ignore
+/codingstyle.xml export-ignore
+/CONTRIBUTING.md export-ignore
+/Jenkinsfile export-ignore
+/jest.config.js export-ignore
+/phpunit.xml export-ignore
+/sonar-project.properties export-ignore
+/webpack* export-ignore