Use collection expressions

[martincostello]

• Add more usage of C# 12 collection expressions.
• Remove redundant null checks.

[costellobot]

Device	URL
desktop	https://localhost:5001

Device	URL
mobile	https://localhost:5001

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (42f79bc) 79.07% compared to head (3992860) 79.10%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2007      +/-   ##
==========================================
+ Coverage   79.07%   79.10%   +0.03%     
==========================================
  Files         153      153              
  Lines        3235     3235              
  Branches      510      509       -1     
==========================================
+ Hits         2558     2559       +1     
  Misses        464      464              
+ Partials      213      212       -1     

Flag	Coverage Δ
linux	79.10% <95.65%> (+0.03%)	⬆️
macos	79.10% <95.65%> (?)
windows	79.10% <95.65%> (+0.03%)	⬆️

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Files	Coverage Δ
...vel.Site/Middleware/CustomHttpHeadersMiddleware.cs	88.31% <100.00%> (ø)
.../LondonTravel.Site/Controllers/ManageController.cs	65.94% <75.00%> (+0.54%)	⬆️

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