Cleanup: use print/printn for simple string literals and drop redundant sprintf

[charlesroddie]

Follow-up to #20542, for format strings with no holes.

• printfn "..." → printn "..." and printf "..." → print "..." where the referenced FSharp.Core has them
• sprintf "..." → "..." (no FSharp.Core dependency, so compiler code is included)
• Fixes Array/List/Seq iteri doc examples that used printfn "{i}: {v}" without $

Changed

• FSharp.Core XML doc examples (async, fslib-extra-pervasives, array, list, seq)
• Commented-out code in the compiler and coroutines.fsx
• FSharp.Core.UnitTests (always references the FSharp.Core project)
• TheBigFileOfDebugStepping.fsx, docs/debug-emit.md
• SDK-run scripts: codingConventions.fsx, identifierAnalysisByType.fsx, ExtractTimingsFromBinlog.fsx, pick-insert-line.fsx
• RemoveUnnecessaryParenthesesTests (continuation lines re-indented where offside alignment depended on name length)
• sprintf removed in TypedTree.fs ToString overrides, TestLib.Utils.fs, attributes/test.fsx, topinit/generate.fsx

Not changed

• Compiler and FSharp.Compiler.Service.slnx project code using printfn/printf: builds against the shipped FSharp.Core 10.0.101, which lacks print/printn.
• Test source compiled at test time, compat test projects and benchmarks.
• sprintf "Hello" = "Hello" in libtest (prevents constant folding) and EditorTests.fs format-string range tests.
• Tutorial.fsx project template: users may build against an older FSharp.Core.

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[github-actions]

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[github-actions]

🔍 Tooling Safety Check — Affects-Agent-Config, Affects-Bootstrap, Affects-Build-Infra, Affects-Compiler-Output, Affects-Design-Time, Affects-Test-Tooling
Affects-Agent-Config: Modifies release-notes skill script.
Affects-Bootstrap: Modifies compiler and FSharp.Core sources.
Affects-Build-Infra: Modifies build and repository scripts.
Affects-Compiler-Output: Modifies checking, optimization, and typed-tree code.
Affects-Design-Time: Modifies compiler-service and VS integration code.
Affects-Test-Tooling: Modifies test scripts and test utilities.

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