Adding PagerDuty icon to connectors cards

[andreadelrio]

Summary

Checklist

Delete any items that are not applicable to this PR.

• 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
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser
• This was checked for cross-browser compatibility, including a check against IE11

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[kibanamachine]

💔 Build Failed

• continuous-integration/kibana-ci/pull-request
• Commit: 8d462d2

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Test Failures

Kibana Pipeline / x-pack-intake-agent / X-Pack Jest Tests.x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types.actionTypeRegistry.get() works action type static data is as expected

Link to Jenkins

Standard Out

Failed Tests Reporter:
  - Test has not failed recently on tracked branches

Stack Trace

Error: expect(received).toEqual(expected) // deep equality

Expected: "apps"
Received: "test-file-stub"
    at Object.test (/var/lib/jenkins/workspace/elastic+kibana+pipeline-pull-request/kibana/x-pack/plugins/triggers_actions_ui/public/application/components/builtin_action_types/pagerduty.test.tsx:33:39)
    at Object.asyncJestTest (/var/lib/jenkins/workspace/elastic+kibana+pipeline-pull-request/kibana/node_modules/jest-jasmine2/build/jasmineAsyncInstall.js:102:37)
    at resolve (/var/lib/jenkins/workspace/elastic+kibana+pipeline-pull-request/kibana/node_modules/jest-jasmine2/build/queueRunner.js:43:12)
    at new Promise (<anonymous>)
    at mapper (/var/lib/jenkins/workspace/elastic+kibana+pipeline-pull-request/kibana/node_modules/jest-jasmine2/build/queueRunner.js:26:19)
    at promise.then (/var/lib/jenkins/workspace/elastic+kibana+pipeline-pull-request/kibana/node_modules/jest-jasmine2/build/queueRunner.js:73:41)

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