fix(logging): use light-background palette on TeamCity

[leno23]

Summary

• When TEAMCITY_VERSION is set, use a console palette tuned for TeamCity's light build log background (darker foreground colors, especially for Information-level output).

Motivation

Relates to #3245 / #2976 — GitHub Actions/Azure Pipelines need readable output on dark logs; TeamCity needs the opposite on its white log background.

Test plan

• Added CakeBuildLogTests coverage for TeamCity ANSI and system-console colorization
• dotnet test src/Cake.Core.Tests/Cake.Core.Tests.csproj --filter FullyQualifiedName~TeamCity

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