Canonical CI: grouped-tests.yml + root test/test_groups.toml

[ChrisRackauckas-Claude]

Summary

Converts the root CI test workflow to the canonical SciML thin caller of grouped-tests.yml@v1, declaring the version/group matrix once in a root test/test_groups.toml instead of hand-maintaining it in YAML.

• .github/workflows/CI.yml: the hand-maintained group × version matrix job is replaced by the thin caller:

  jobs:
    tests:
      uses: "SciML/.github/.github/workflows/grouped-tests.yml@v1"
      secrets: "inherit"

  No with: overrides are needed — the old job used tests.yml's defaults for check-bounds (yes) and coverage (true), which match grouped-tests.yml's defaults. The on: and concurrency: blocks are preserved verbatim. Linux-only (no os field).
• test/test_groups.toml (new root matrix):

  [Core]
  versions = ["lts", "1", "pre"]
  
  [QA]
  versions = ["lts", "1"]

• test/runtests.jl: adds GROUP dispatch. The existing suite runs under Core/All; QA activates the isolated test/qa environment and runs Aqua/JET.
• test/qa/ (new): isolated QA env — Aqua + JET + Test + the package via a path [sources] entry — running Aqua.test_all(DiffEqParamEstim) and JET.test_package(DiffEqParamEstim; target_defined_modules=true).
• Project.toml: benign metadata fixes — bump julia compat floor 1.6 → 1.10 (LTS), and add [compat] entries for every [extras] dependency that lacked one.

Matrix match

Old matrix (CI.yml): group = All on versions 1, lts, pre (3 cells, ubuntu-latest).

New matrix, emitted by compute_affected_sublibraries.jl . --root-matrix (verified statically):

• Core × {lts, 1, pre} — reproduces the old 3-cell test matrix exactly (group renamed All → Core per the canonical convention; runtests.jl dispatches both to the same suite).
• QA × {lts, 1} — newly wired Aqua/JET (2 new cells).

QA group newly wired; Aqua/JET run in CI — any failures will be triaged in a follow-up.

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Ignore until reviewed by @ChrisRackauckas.

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