style: add community Contact Timeline and Process Steps tokens of denhaag

[jeffreylauwers]

• This PR will provide the necessary tokens for the Contact Timeline component of Den Haag.
• Because the Contact Timeline component also used tokens of the Process Steps component I added those as well.
• We also update the value of common tokens 'container' and 'line' to a slightly darker gray.

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Name	Status	Preview	Comments	Updated (UTC)
themes	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 10, 2024 8:42am

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.48%. Comparing base (6e71cbb) to head (6ebb4a4).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #838   +/-   ##
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  Coverage   89.48%   89.48%           
=======================================
  Files          19       19           
  Lines        1332     1332           
  Branches      178      125   -53     
=======================================
  Hits         1192     1192           
  Misses        140      140           

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