SKA: Misc code enhancements to reduce merge conflicts (elastic#204785)

## Summary

* `packages/kbn-babel-preset/styled_components_files.js`
  * unfolded `a|b` patterns
  * removed duplicates
  * removed incorrect patterns

* `x-pack/.gitignore`
  * move plugin patterns to specific `.gitignore` files

packages/kbn-babel-preset/styled_components_files.js

@@ -13,16 +13,30 @@ module.exports = {
    * Used by `kbn-babel-preset` and `kbn-eslint-config`.
    */
   USES_STYLED_COMPONENTS: [
-    /packages[\/\\]kbn-ui-shared-deps-(npm|src)[\/\\]/,
-    /src[\/\\]plugins[\/\\](kibana_react)[\/\\]/,
-    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\](exploratory_view|investigate|investigate_app|observability|observability_ai_assistant_app|observability_ai_assistant_management|observability_solution|serverless_observability|streams|streams_app|synthetics|uptime|ux)[\/\\]/,
-    /x-pack[\/\\]plugins[\/\\](beats_management|fleet|observability_solution\/observability|observability_solution\/observability_shared|observability_solution\/exploratory_view|security_solution|timelines|observability_solution\/synthetics|observability_solution\/ux|observability_solution\/uptime)[\/\\]/,
-    /x-pack[\/\\]solutions[\/\\]security[\/\\]plugins[\/\\](beats_management|fleet|lists|observability_solution\/observability|observability_solution\/observability_shared|observability_solution\/exploratory_view|security_solution|timelines|observability_solution\/synthetics|observability_solution\/ux|observability_solution\/uptime)[\/\\]/,
-    /x-pack[\/\\]test[\/\\]plugin_functional[\/\\]plugins[\/\\]resolver_test[\/\\]/,
-    /x-pack[\/\\]packages[\/\\]elastic_assistant[\/\\]/,
+    /packages[\/\\]kbn-ui-shared-deps-npm[\/\\]/,
+    /packages[\/\\]kbn-ui-shared-deps-src[\/\\]/,
+    /src[\/\\]plugins[\/\\]kibana_react[\/\\]/,
+    /x-pack[\/\\]platform[\/\\]packages[\/\\]shared[\/\\]kbn-elastic-assistant[\/\\]/,
+    /x-pack[\/\\]plugins[\/\\]fleet[\/\\]/,
+    /x-pack[\/\\]plugins[\/\\]observability_solution[\/\\]observability_shared[\/\\]/,
+    /x-pack[\/\\]plugins[\/\\]security_solution[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]exploratory_view[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]investigate_app[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]investigate[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]observability_ai_assistant_app[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]observability_ai_assistant_management[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]observability_solution[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]observability[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]serverless_observability[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]streams_app[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]streams[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]synthetics[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]uptime[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]observability[\/\\]plugins[\/\\]ux[\/\\]/,
     /x-pack[\/\\]solutions[\/\\]security[\/\\]packages[\/\\]ecs_data_quality_dashboard[\/\\]/,
+    /x-pack[\/\\]solutions[\/\\]security[\/\\]plugins[\/\\]lists[\/\\]/,
     /x-pack[\/\\]solutions[\/\\]security[\/\\]plugins[\/\\]security_solution[\/\\]/,
-    /x-pack[\/\\]platform[\/\\]packages[\/\\]shared[\/\\]kbn-elastic-assistant[\/\\]/,
-    /x-pack[\/\\]solutions[\/\\]security[\/\\]plugins[\/\\]lists/,
+    /x-pack[\/\\]solutions[\/\\]security[\/\\]plugins[\/\\]timelines[\/\\]/,
+    /x-pack[\/\\]test[\/\\]plugin_functional[\/\\]plugins[\/\\]resolver_test[\/\\]/,
   ],
 };

x-pack/.gitignore

@@ -5,10 +5,15 @@
 /test/functional/screenshots
 /test/functional/apps/**/reports/session
 /test/reporting/configs/failure_debug/
+
+# TODO remove once all of the modules have been relocated
+# we keep them around to avoid conflicts derived of merge commits,
+# suddenly adding a huge amount of files due to these rules being outdated
 /plugins/reporting/.chromium/
-/platform/plugins/shared/screenshotting/chromium/
-/plugins/screenshotting/chromium/
 /plugins/reporting/.phantom/
+/plugins/screenshotting/.chromium/
+/plugins/screenshotting/chromium/
+
 /.aws-config.json
 /.env
 /.kibana-plugin-helpers.dev.*

x-pack/platform/plugins/shared/screenshotting/.gitignore

@@ -0,0 +1,2 @@
+/chromium/
+/.chromium/

x-pack/plugins/reporting/.gitignore

@@ -0,0 +1,3 @@
+/chromium/
+/.chromium/
+/.phantom/