Add .puppeteerrc (#179847)

Puppeteer uses cosmiconfig to load configuration files. We're seeing
permissions issues for various reasons due to the global search strategy
employed by puppeteer.

This should short circuit configuration lookups outside of the Kibana
directory.

Closes https://github.com/elastic/kibana/issues/168639

https://pptr.dev/api/puppeteer.configuration

.puppeteerrc

@@ -0,0 +1 @@
+skipDownload: true

src/dev/build/tasks/copy_legacy_source_task.ts

@@ -21,6 +21,7 @@ export const CopyLegacySource: Task = {
     const select = [
       'yarn.lock',
       '.npmrc',
+      '.puppeteerrc',
       'config/kibana.yml',
       'config/node.options',
       '.i18nrc.json',