Refactor: simplify null and published check for language

[RyanDDDDDD]

Summary

Simplified the conditional check for language retrieval to improve readability.

Changes

• Replaced the expression if (!language?.Published ?? false) with a clearer equivalent:

  if (language == null || !language.Published)
      language = await _workContext.GetWorkingLanguageAsync();

[RomanovM]

@RyanDDDDDD Why? There are tons of similar checks within the solution

[RyanDDDDDD]

The reason I changed this specific check is readability.

if (language == null || !language.Published) is easier to parse at a glance than
if (!language?.Published ?? false)