Update the cards & article colour theme/palette for special report

[rhiannareechaye]

Here's the designs
Here's the palette in code

Ed tools

• Create a new campaign type of ‘special report alt’ in targeting tool

Dotcom

• Add SpecialReportAlt to [format theme(https://github.com/guardian/csnx/blob/main/libs/%40guardian/libs/src/format/ArticleSpecial.ts): https://github.com/Add SpecialReportAlt theme article format csnx#132

• Update DCR and AR to use the new version of and @guardian/source-foundations: Update Source packages #6178

• Update DCR and AR to use the new version of @guardian/libs: Bump @guardian/[email protected] #6174

• Style articles in dotcom-rendering as per designs: Add articles styles for SpecialReportAlt #6313

• Style cards in dotcom-rendering as per designs: Add cards styles for SpecialReportAlt #6314

• Style cards in frontend as per designs (PRs in order they should be merged):

  • Add SpecialReportAltTheme to Format content-api-scala-client#371
  • Add SpecialReportAlt to CardStyle facia-scala-client#280
  • Add SpecialReportAlt card styles frontend#25602

• Add special report to content-api-scala-client: Add SpecialReportAltTheme to Format content-api-scala-client#371