Move mustache typings to devDependencies

[weltenwort]

Summary

This moves the @types/mustache package from dependencies to devDependencies to avoid unnecessary inclusion in the build artifacts.

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility

For maintainers

• [ ] This was checked for breaking API changes and was labeled appropriately
• [ ] This includes a feature addition or change that requires a release note and was labeled appropriately

[elasticmachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request

[weltenwort]

rebased on master, trying again...

[elasticmachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request

[weltenwort]

that was quick...

00:06:48.568 FATAL: no longer a configured node for kibana-ci-immutable-flyweight-1539850858081048102
00:06:48.569 java.lang.IllegalStateException: no longer a configured node for kibana-ci-immutable-flyweight-1539850858081048102
00:06:48.569 	at hudson.model.AbstractBuild$AbstractBuildExecution.getCurrentNode(AbstractBuild.java:415)
00:06:48.569 	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:455)
00:06:48.569 	at com.tikal.jenkins.plugins.multijob.MultiJobBuild$MultiJobRunnerImpl.run(MultiJobBuild.java:148)
00:06:48.569 	at hudson.model.Run.execute(Run.java:1815)
00:06:48.569 	at com.tikal.jenkins.plugins.multijob.MultiJobBuild.run(MultiJobBuild.java:76)
00:06:48.569 	at hudson.model.ResourceController.execute(ResourceController.java:97)
00:06:48.569 	at hudson.model.Executor.run(Executor.java:429)
00:06:48.588 Setting status of 2762872094617cb603edcb5e4a99bb9812249db8 to FAILURE with url https://kibana-ci.elastic.co/job/elastic-kibana-pull-request/5239/ and message: 'Build finished. '

jenkins, test this again... I guess... 🎠

[elasticmachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request

[weltenwort]

00:00:48.598 Installing dependencies in [@kbn/babel-preset]:
00:00:48.599 
00:00:49.082 [1/4] Resolving packages...
00:00:49.181 [2/4] Fetching packages...
00:01:19.310 error An unexpected error occurred: "https://registry.yarnpkg.com/babel-helper-function-name/-/babel-helper-function-name-6.24.1.tgz: ETIMEDOUT".
00:01:19.310 info If you think this is a bug, please open a bug report with the information provided in "/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-intake/kibana/packages/kbn-babel-preset/yarn-error.log".
00:01:19.313 info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
00:01:19.323 
00:01:19.323 [bootstrap] failed:
00:01:19.323 
00:01:19.328 Error: Command failed: yarn install --check-files --non-interactive --mutex=file
00:01:19.328     at makeError (/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-intake/kibana/packages/kbn-pm/dist/index.js:35532:9)
00:01:19.328     at Promise.all.then.arr (/var/lib/jenkins/workspace/elastic+kibana+pull-request+multijob-intake/kibana/packages/kbn-pm/dist/index.js:35637:16)
00:01:19.332     at <anonymous>
00:01:19.332     at process._tickCallback (internal/process/next_tick.js:188:7)
00:01:19.335 error Command failed with exit code 1.

jenkins, test this again 🎠

[elasticmachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request

[weltenwort]

00:53:51.146              └- ✖ fail: "dashboard app using legacy data dashboard clone Clones on confirm duplicate title warning"
00:53:51.146              │      retry.try timeout: Error: retry.try timeout: [POST http://localhost:9515/session/39655221907c830631546fd42c75932a/element/0.8136785890260154-73/click] unknown error: Element <a class="kuiLocalBreadcrumb__link" href="#/dashboards">...</a> is not clickable at point (227, 14). Other element would receive the click: <div class="euiOverlayMask">...</div>
00:53:51.146              │   (Session info: chrome=70.0.3538.67)
00:53:51.150              │   (Driver info: chromedriver=2.42.591071 (0b695ff80972cc1a65a5cd643186d2ae582cd4ac),platform=Linux 3.10.0-862.14.4.el7.x86_64 x86_64)

looks like a flaky dashboard test... jenkins, test this once more

[elasticmachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request

[mistic]

LGTM