Remove 'Create Rule' button from Rule Group page (elastic#164167)

issue: elastic#163462

## Summary

Change of plan. We are going to delete the button.

~Disable the 'Create Rule' button on the Rule Group page and add the
read icon to the topbar when the user is on read mode.~
Delete 'Create Rule' button on the Rule Group page

### How to reproduce it
* ~Create a role with read access to the security solution feature~
* ~Login with a user that has the created role~
* Open the rule group page

### Checklist

Delete any items that are not applicable to this PR.

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

(cherry picked from commit 9aafd1f)

x-pack/plugins/security_solution/public/rules/landing.tsx

@@ -7,14 +7,13 @@
 import React from 'react';
 import { i18n } from '@kbn/i18n';
 import { TrackApplicationView } from '@kbn/usage-collection-plugin/public';
-import { EuiFlexGroup, EuiFlexItem, EuiSpacer } from '@elastic/eui';
+import { EuiSpacer } from '@elastic/eui';
 import { LandingLinksIconsCategories } from '@kbn/security-solution-navigation/landing_links';
 import { SecurityPageName } from '../../common';
 import { PluginTemplateWrapper } from '../common/components/plugin_template_wrapper';
 import { SecuritySolutionPageWrapper } from '../common/components/page_wrapper';
 import { SpyRoute } from '../common/utils/route/spy_routes';
 import { Title } from '../common/components/header_page/title';
-import { SecuritySolutionLinkButton } from '../common/components/links';
 import { useRootNavLink } from '../common/links/nav_links';
 import { useGlobalQueryString } from '../common/utils/global_query_string';
 import { trackLandingLinkClick } from '../common/lib/telemetry/trackers';
@@ -23,23 +22,6 @@ const RULES_PAGE_TITLE = i18n.translate('xpack.securitySolution.rules.landing.pa
   defaultMessage: 'Rules',
 });
 
-const CREATE_RULE_BUTTON = i18n.translate('xpack.securitySolution.rules.landing.createRule', {
-  defaultMessage: 'Create rule',
-});
-
-const RulesLandingHeader: React.FC = () => (
-  <EuiFlexGroup gutterSize="none" direction="row">
-    <EuiFlexItem>
-      <Title title={RULES_PAGE_TITLE} />
-    </EuiFlexItem>
-    <EuiFlexItem grow={false}>
-      <SecuritySolutionLinkButton deepLinkId={SecurityPageName.rulesCreate} iconType="plusInCircle">
-        {CREATE_RULE_BUTTON}
-      </SecuritySolutionLinkButton>
-    </EuiFlexItem>
-  </EuiFlexGroup>
-);
-
 export const RulesLandingPage = () => {
   const { links = [], categories = [] } = useRootNavLink(SecurityPageName.rulesLanding) ?? {};
   const urlState = useGlobalQueryString();
@@ -48,7 +30,7 @@ export const RulesLandingPage = () => {
     <PluginTemplateWrapper>
       <TrackApplicationView viewId={SecurityPageName.rulesLanding}>
         <SecuritySolutionPageWrapper>
-          <RulesLandingHeader />
+          <Title title={RULES_PAGE_TITLE} />
           <EuiSpacer size="xl" />
           <LandingLinksIconsCategories
             links={links}