Use SciMLTesting v1.1.0 (run_tests harness)

[ChrisRackauckas-Claude]

Use SciMLTesting v1.1.0 (run_tests harness)

Replaces the hand-written if GROUP == ... dispatcher in root test/runtests.jl with a single declarative SciMLTesting.run_tests call (v1.1.0). Behavior-equivalent refactor: the exact set of tests run under every GROUP value — including bare/All — is unchanged. No test assertions or test logic were modified.

Richest-monorepo shape (sublib_env + umbrellas + curated all)

This is the richest conversion shape: a monorepo whose root dispatches both to functional groups and to lib/<Sublibrary> sub-packages.

• Curated all = [InterfaceI..V, Integrators_I, Integrators_II, Regression_I, Regression_II] — the precise membership of the old GROUP == "All" branches, in order. It deliberately excludes QA, AlgConvergence_*, Downstream, AD, and ODEInterfaceRegression, none of which the old All branch ran. (The v1.0.0 all === nothing fallback would have incorrectly folded QA into All — this is the bug this corrected pass fixes.) There is no root Core body, so core = () -> nothing and "Core" is omitted from all.
• umbrellas = Interface => [I..V], Integrators => [I, II], Regression => [I, II] — reproduce the old GROUP == "Interface"/"Integrators"/"Regression" branches (one GROUP triggers several).
• sublib_env = "ODEDIFFEQ_TEST_GROUP" + lib_dir = ../lib — reproduce the monorepo sublibrary dispatch: the root reads GROUP to pick lib/<sub>, then Pkg.tests it with the sub-group handed off via ENV["ODEDIFFEQ_TEST_GROUP"].
• Version/prerelease gates preserved as thin guards inside the group thunks (v1.1.0 exposes no kwarg for these): the Null u0 test stays gated by VERSION >= v"1.11" && isempty(VERSION.prerelease), and ODEInterfaceRegression stays gated by isempty(VERSION.prerelease). The vestigial is_APPVEYOR guard is also preserved.
• AD / Downstream / ODEInterfaceRegression keep their original Pkg.activate/develop/instantiate thunks (not env = group specs) so their Julia <1.11 dependency resolution stays byte-for-byte identical (the env = path would additionally develop the sub-env's [sources] on 1.10, a behavior change on the lts matrix cell).

Deps

• Add SciMLTesting (09d9d899-5365-40a9-917a-5f67fddea283) to [extras], the test target, and [compat] (= "1").
• Pkg is retained in the test deps because the activate_*_env thunks still call it directly.
• No test/qa/Project.toml exists (QA runs ExplicitImports in the root test env), so nothing was added there.

Verification

• TOML.parsefile on Project.toml; Meta.parseall on runtests.jl and qa/qa_tests.jl — all clean, no conflict markers.
• Routing dry-run: drove run_tests with this exact groups/all/umbrellas/sublib_env/lib_dir config under every GROUP value and confirmed the set of group keys run matches the old dispatcher for all of: All, InterfaceI..V, Interface, Integrators_I/II, Integrators, Regression_I/II, Regression, AlgConvergence_I/III, Downstream, AD, ODEInterfaceRegression, QA, Core, AlgConvergence_II, ModelingToolkit. Sublibrary routing was exercised end-to-end (Pkg.test(OrdinaryDiffEqTsit5) passed; OrdinaryDiffEqBDF_QA correctly handed QA off via ODEDIFFEQ_TEST_GROUP).

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Draft. Ignore until reviewed by @ChrisRackauckas.

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