Normalize nopre -> QA (+ split AD/Enzyme)

[ChrisRackauckas-Claude]

Part of the fleet-wide nopre/NoPre test-group normalization (policy: standard Aqua/JET/ExplicitImports checks live in the canonical QA group; pre-incompatible functional/AD tests get their own content-named group). Root package only — lib/* sublibraries have no NoPre group and are untouched.

Survey result: the root NoPre group was MIXED — JET (standard QA) plus Enzyme/Mooncake/AllocCheck/StaticArrays functional tests — so it is SPLIT:

• QA now also carries JET. jet.jl moves from test/nopre into the existing test/qa env; its Project.toml gains JET plus the deps jet.jl uses (ForwardDiff, RecursiveFactorization, LinearAlgebra, SparseArrays). The QA dispatch runs qa.jl and jet.jl; QA stays at versions = ["lts","1"].
• AD (new group): mooncake.jl, enzyme.jl, static_arrays.jl, caching_allocation_tests.jl move from test/nopre into test/AD (former nopre env minus JET). [AD] at versions = ["lts","1"]; not run on prerelease. The Julia >= 1.12 Enzyme guard is preserved.

The old [NoPre] key, test/nopre dir, and NoPre dispatch are removed. Only test_groups.toml, runtests.jl, and the two test-env files changed; test file bodies are unchanged (moved verbatim). No edits to test/core, test/hsl, test/pureumfpack, etc.

Static-verified locally: test_groups.toml parses; both env Project.toml files parse; runtests.jl passes Meta.parseall; qa env has Aqua+JET, AD env has Enzyme+Mooncake and no JET.

Ignore until reviewed by @ChrisRackauckas.

🤖 Generated with Claude Code