feat: fix multiple api requests and datatable

[katrinan029]

Description

• Refactors to remove duplicate calls to enterprise susbsidy and license manager api
• Updates user datatable to display in zero state
• Adds keys to customer integration cards

https://2u-internal.atlassian.net/browse/ENT-9477

Test plan

1. checkout branch knguyen2/ent-9477
2. at the root directory, add file webpack.dev.config.js with the following content:

const { createConfig } = require('@openedx/frontend-build');

module.exports = createConfig('webpack-dev', {
  devServer: {
    allowedHosts: 'all',
    https: true,
  },
});

3. replace the content in .env.development with this info:

NODE_ENV='development'
PORT=18450
FEATURE_CUSTOMER_SUPPORT_VIEW='true'
ADMIN_PORTAL_BASE_URL='https://portal.stage.edx.org'
ACCESS_TOKEN_COOKIE_NAME='stage-edx-jwt-cookie-header-payload'
BASE_URL='https://localhost.stage.edx.org:18450'
FEATURE_CONFIGURATION_MANAGEMENT='true'
FEATURE_CONFIGURATION_ENTERPRISE_PROVISION='true'
FEATURE_CONFIGURATION_EDIT_ENTERPRISE_PROVISION='true'
CREDENTIALS_BASE_URL='https://credentials.stage.edx.org'
CSRF_TOKEN_API_PATH='/csrf/api/v1/token'
ECOMMERCE_BASE_URL='https://ecommerce.stage.edx.org'
ENTERPRISE_ACCESS_BASE_URL='https://enterprise-access.stage.edx.org'
LANGUAGE_PREFERENCE_COOKIE_NAME='openedx-language-preference'
LMS_BASE_URL='https://courses.stage.edx.org'
LICENSE_MANAGER_URL='https://license-manager.stage.edx.org'
LICENSE_MANAGER_DJANGO_URL='https://license-manager-internal.stage.edx.org'
SUPPORT_CONFLUENCE='https://support-tools.edx.org'
SUPPORT_CUSTOMER_REQUEST='https://support-tools.edx.org'
DISCOVERY_API_BASE_URL='https://discovery.stage.edx.org'
LOGIN_URL='https://courses.stage.edx.org/login'
LOGOUT_URL='https://courses.stage.edx.org/logout'
LOGO_URL=https://edx-cdn.org/v3/default/logo.svg
LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
LOGO_WHITE_URL=https://edx-cdn.org/v3/default/logo-white.svg/
FAVICON_URL=https://edx-cdn.org/v3/default/favicon.ico
MARKETING_SITE_BASE_URL='https://stage.edx.org'
ORDER_HISTORY_URL='https://orders.stage.edx.org/orders'
REFRESH_ACCESS_TOKEN_ENDPOINT='https://courses.stage.edx.org/login_refresh'
SEGMENT_KEY=null
SITE_NAME='edX'
SUBSIDY_BASE_URL='https://enterprise-subsidy.stage.edx.org'
SUBSIDY_BASE_DJANGO_URL='https://enterprise-subsidy-internal.stage.edx.org'
USER_INFO_COOKIE_NAME='edx-user-info'
PUBLISHER_BASE_URL='https://publisher.stage.edx.org/'
APP_ID='support-tools'
MFE_CONFIG_API_URL='https://courses.stage.edx.org/api/mfe_config/v1'

3. run npm run start
4. go to link https://localhost.stage.edx.org:18450/enterprise-configuration/customers/02982884-1f1f-4103-b6d7-3a602c1afcbd/view open your network tab and verify that there is only one request made to the license-manager api and subsidy api.
5. go to link https://localhost.stage.edx.org:18450/enterprise-configuration/customers/1847b3ae-5013-4b49-9d78-0b12f660e4e1/view and verify you see an "Associated users" datatable.
6. go to link https://localhost.stage.edx.org:18450/enterprise-configuration/customers/02982884-1f1f-4103-b6d7-3a602c1afcbd/view open your dev console and verify that you do not see an error message for missing key prop in CustomerIntegrations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.40%. Comparing base (df46942) to head (1f465ae).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
- Coverage   84.73%   84.40%   -0.34%     
==========================================
  Files         185      185              
  Lines        3852     3840      -12     
  Branches      938      943       +5     
==========================================
- Hits         3264     3241      -23     
- Misses        566      576      +10     
- Partials       22       23       +1     

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