Fix flaky client integration tests for index template creation

[cjcenizal]

 FAIL  legacy/plugins/index_management/__jest__/client_integration/template_create.test.tsx (16.091s)
  ● <TemplateCreate /> › on component mount › form payload & api errors › should send the correct payload

    Method “simulate” is meant to be run on 1 node. 0 found instead.

      139 | 
      140 |     if (aliases) {
    > 141 |       find('mockCodeEditor').simulate('change', {
          |                              ^
      142 |         jsonString: aliases,
      143 |       }); // Using mocked EuiCodeEditor
      144 |       await nextTick(50);

      at ReactWrapper.single (../node_modules/enzyme/src/ReactWrapper.js:1166:13)
      at ReactWrapper.simulate (../node_modules/enzyme/src/ReactWrapper.js:665:17)
      at Object.completeStepFour (legacy/plugins/index_management/__jest__/client_integration/helpers/template_form.helpers.ts:141:30)
      at legacy/plugins/index_management/__jest__/client_integration/template_create.test.tsx:322:25

  ● <TemplateCreate /> › on component mount › form payload & api errors › should send the correct payload

    Method “simulate” is meant to be run on 1 node. 0 found instead.

      47 | 
      48 |   const clickSubmitButton = () => {
    > 49 |     testBed.find('submitButton').simulate('click');
         |                                  ^
      50 |   };
      51 | 
      52 |   const clickEditButtonAtField = (index: number) => {

      at ReactWrapper.single (../node_modules/enzyme/src/ReactWrapper.js:1166:13)
      at ReactWrapper.simulate (../node_modules/enzyme/src/ReactWrapper.js:665:17)
      at Object.clickSubmitButton (legacy/plugins/index_management/__jest__/client_integration/helpers/template_form.helpers.ts:49:34)
      at legacy/plugins/index_management/__jest__/client_integration/template_create.test.tsx:330:19
      at batchedUpdates$1 (../node_modules/react-dom/cjs/react-dom.development.js:24386:12)
      at act (../node_modules/react-dom/cjs/react-dom-test-utils.development.js:1092:14)
      at Object.it (legacy/plugins/index_management/__jest__/client_integration/template_create.test.tsx:329:15)

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[cjcenizal]

@alisonelizabeth FYI I'm disabling these in #52835.