Deprecate ConfigProviderBase drupalGetPath() and drupalGetProfile() methods

Waiting on 📌 GitLabCI: Fix existing PHPCS issues Active .

Looks good, as long as we remember to include it in the 3.0.0-alpha2 release.

Verified that implementers of ConfigProviderBase receive the expected deprecation warnings:

 ------ ----------------------------------------------------------------------------------------------------------------- 
  Line   web/modules/custom/test_provider/src/Plugin/ConfigProvider/TestConfigProvider.php  
 ------ ----------------------------------------------------------------------------------------------------------------- 
  332    Call to deprecated method drupalGetProfile() of class Drupal\config_provider\Plugin\ConfigProviderBase:          
         in config_provider:3.0.0-alpha2 and is removed from config_provider:3.1.0.                                       
           ConfigProviderBase::installProfile should be used instead.                                                     
  333    Call to deprecated method drupalGetPath() of class Drupal\config_provider\Plugin\ConfigProviderBase:             
         in config_provider:3.0.0-alpha2 and is removed from config_provider:3.1.0.                                       
           ConfigProviderBase::extensionPathResolver::getPath() should be used                                            
           instead.                                                                                                       
 ------ -----------------------------------------------------------------------------------------------------------------

Thanks @joegraduate !

Automatically closed - issue fixed for 2 weeks with no activity.