UHF-8909: Preprocess refactoring

[khalima]

UHF-8909

What was done

• Added hook_template_preprocess_default_variables_alter() function, where we can add the current page language and alternate language as default variables for each preprocess, but in a cheaper way.

How to install

• Make sure your instance is up and running on correct branch.
  • git checkout UHF-8909
  • make fresh
• Run make drush-cr

How to test

• Check any template and dump {{ language.id }} and/or {{ alternative_language }}
• Check that code follows our standards

Continuous documentation

• This feature has been documented/the documentation has been updated
• This change doesn't require updates to the documentation

Automatic- / Regression tests

• This PR makes no changes that effects any tests. (This will be caught in automatic testing later on, but please, please run regression tests always on PR before asking for a review)
• This PR passes regression tests. (make test-pw)

Other PRs

• UHF-8909 Preprocess function refactor drupal-hdbt-admin#292
• UHF-8909 Preprocess function refactor drupal-hdbt#1028

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.00%. Comparing base (4165398) to head (115ce4d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #173   +/-   ##
=========================================
  Coverage     89.00%   89.00%           
  Complexity      518      518           
=========================================
  Files            76       76           
  Lines          2064     2064           
=========================================
  Hits           1837     1837           
  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