[C# 14-Errors and warnings]: New Feature - strings in data section

[BillWagner]

Visual Studio release

other - specify below

Link to speclet

• Speclet

Link to Pull request

• PR

Errors and warnings added for this feature

• "CS9315"

This would be better combined with string literal errors and warnings. I broke it off from #46376 for scope reasons.

What language theme applies, for consolidation of articles

No response

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Associated WorkItem - 436521