Add elasticsearch connector plugin

[hyrsky]

Related to https://helsinkisolutionoffice.atlassian.net/browse/UHF-10549.

Service addresses use self signed sertificate. To use them, we need to configure elasticsearch_connector module such that it accepts these sertificates.

How to test:

Run: composer require drupal/helfi_api_base:dev-UHF-10990.

In infofinland, add

$config['search_api.server.default']['backend_config']['connector'] = 'basicauth';
$config['search_api.server.default']['backend_config']['connector_config']['url'] = 'https://self-signed.badssl.com/';
$config['search_api.server.default']['backend_config']['connector_config']['username'] = '123';
$config['search_api.server.default']['backend_config']['connector_config']['password'] = '456';

to local.settings.php.

https://drupal-infofinland.docker.so/admin/config/search/search-api/server/default should die to certificate errors.

Change to

$config['search_api.server.default']['backend_config']['connector'] = 'helfi_connector';
$config['search_api.server.default']['backend_config']['connector_config']['url'] = 'https://self-signed.badssl.com/';
$config['search_api.server.default']['backend_config']['connector_config']['username'] = '123';
$config['search_api.server.default']['backend_config']['connector_config']['password'] = '456';

https://drupal-infofinland.docker.so/admin/config/search/search-api/server/default should not die. Should give error "The ElasticSearch cluster could not be reached. Further data is therefore unavailable." because 'https://self-signed.badssl.com/' is not elasticsearch server.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.14%. Comparing base (bfada1e) to head (343f0eb).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #189      +/-   ##
============================================
+ Coverage     89.11%   89.14%   +0.03%     
- Complexity      522      523       +1     
============================================
  Files            77       78       +1     
  Lines          2085     2091       +6     
============================================
+ Hits           1858     1864       +6     
  Misses          227      227              

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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