[Diagnostics][NFC]Move fix-it text formatting later in the diagnostics pipeline #26711
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This builds on and includes the commit from #26612
Defer fix-it text formatting to individual DiagnosticConsumers so it can be customized or omitted as needed, similar to how it's done for errors, warnings, and notes
Move DiagnosticArgument, DiagnosticFormatOptions, and formatDiagnosticText out of DiagnosticEngine and into DiagnosticFormatting, to avoid circular dependencies between DiagnosticEngine and DiagnosticConsumer (this is the bulk of the diff, but should be a generally beneficial refactor)