feat: add zero state for customer view headers

[katrinan029]

Description

Adds logic to handle zero states in the customer view page.

1. Hide the “Show inactive” toggle instead of disabling it if a customer does not have inactive plans.
2. Hide the "Associated subsidy plan" header if the customer does not have inactive or active plans.
3. Hide the "Associated integrations" header if the customer does not have active integrations.
4. Hide the "Associated users" header if the customer does not have users.

Test Plan on Stage

1. checkout branch knguyen2/ent-9447 and run npm install
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-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'
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'

4. verify that you do not see the “Show inactive” toggle for the following customer: https://support-tools.stage.edx.org/enterprise-configuration/customers/66b5922b-a22b-4a7b-b587-d4af0378bd6f/view
5. verify that you do not see the “Associated subsidy plans” header for the following customer: https://support-tools.stage.edx.org/enterprise-configuration/customers/beafadc5-69cc-48ce-a9a1-532067d9af0f/view
6. verify that you do not see the “Associated integrations” header for the following customer: https://support-tools.stage.edx.org/enterprise-configuration/customers/5d78a4d4-87a3-4db4-b665-2bcaf922edba/view
7. verify that you do not see the “Associated users” header for the following customer: https://support-tools.stage.edx.org/enterprise-configuration/customers/beafadc5-69cc-48ce-a9a1-532067d9af0f/view

https://2u-internal.atlassian.net/browse/ENT-9447

[codecov]

Codecov Report

Attention: Patch coverage is 84.37500% with 5 lines in your changes missing coverage. Please review.

Project coverage is 84.75%. Comparing base (c6ed509) to head (6c963e6).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...omers/CustomerDetailView/CustomerPlanContainer.jsx	80.00%	2 Missing ⚠️
...omers/CustomerDetailView/CustomerViewContainer.jsx	77.77%	2 Missing ⚠️
.../Customers/data/hooks/useCustomerUsersTableData.js	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
+ Coverage   84.49%   84.75%   +0.26%     
==========================================
  Files         185      185              
  Lines        3817     3856      +39     
  Branches      912      938      +26     
==========================================
+ Hits         3225     3268      +43     
+ Misses        570      566       -4     
  Partials       22       22              

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[kiram15]

Everything looks good besides the associated users