UHF-10559: Add support for secondary key authentication

[tuutti]

How to install

• composer require drupal/helfi_api_base:dev-UHF-10559
• See documentation how to test this locally: https://github.com/City-of-Helsinki/drupal-module-helfi-api-base/blob/04724ee736ef95038a7801ec3d90d26b924695eb/documentation/pubsub-messaging.md#testing-locally
• Enter an incorrect <access-key>, but use a valid key in <secondary-access-key> (run echo $DRUPAL_PUBSUB_VAULT inside OpenShift container)

How to test

• Run drush helfi:azure:pubsub-listen and make sure an authentication error is raised
• Make sure the process works with secondary access key and doesn't die
• Enter incorrect <secondary-access-key> and make sure the process fails with valid error code (echo $?)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.94%. Comparing base (0b9012a) to head (04724ee).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #175      +/-   ##
============================================
- Coverage     89.00%   88.94%   -0.06%     
+ Complexity      518      517       -1     
============================================
  Files            76       76              
  Lines          2064     2054      -10     
============================================
- Hits           1837     1827      -10     
  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

See analysis details on SonarCloud