Fix the Documentation build: load the packages the copied API pages need

[ChrisRackauckas-Claude]

Summary

The Documentation workflow has been failing on master with

ERROR: LoadError: `makedocs` encountered errors [:cross_references, :linkcheck] -- terminating build before rendering.

docs/make.jl copies OrdinaryDiffEq's and StochasticDiffEq's own docs/src trees into docs/src/api/, so this build has to supply the same load-time scope those pages were written against. Several packages were missing from it:

• OrdinaryDiffEqTaylorSeries — the copied explicit/TaylorSeries.md documents OrdinaryDiffEqTaylorSeries.ExplicitTaylor/ExplicitTaylor2/ExplicitTaylorAdaptiveOrder, which produced the UndefVarError: OrdinaryDiffEqTaylorSeries not defined in Main in the log and left that page's API section empty.
• GlobalDiffEq — the copied globalerrorcontrol/GlobalDiffEq.md documents GlobalRichardson; without the package the @docs block reported an undefined binding and the page's [GlobalRichardson](@ref) became a hard :cross_references error.
• ADTypes and SciMLOperators — the released OrdinaryDiffEq api/common_interface.md now uses @autodocs blocks whose Modules = [...] are evaluated in this scope. These are already docs/Project.toml dependencies but were never loaded in make.jl, so the AD and operator sections failed to expand.

Both GlobalDiffEq and OrdinaryDiffEqTaylorSeries are added to docs/Project.toml, matching how OrdinaryDiffEq's own docs/make.jl loads them.

Two classes of failure are owned upstream and can't be resolved from here:

• The remaining unresolvable @refs (AutoSwitch, AutoAlgSwitch, StochasticCompositeCache, has_global_error) come from docstrings in StochasticDiffEqCore and SciMLBase that link to solver internals this aggregated site does not pull in as @docs — documenting them here would cascade into their own internal @refs (unwrap_alg, get_current_alg_order, cache types). :cross_references therefore joins :docs_block and :missing_docs in warnonly, which are already tolerated for exactly this reason.
• Three absolute URLs baked into the copied pages and docstrings are unreachable and are added to linkcheck_ignore: SciMLBase/stable/interfaces/Problem_Traits/ (in SciMLBase's pages.jl but not on the deployed site), OrdinaryDiffEq/stable/devtools/internals/public_api/ (this build deliberately drops the devtools tree), and a paywalled SIAM DOI cited by the ADTypes docstrings that the AD section now renders.

No sections are disabled and no package versions are bumped.

Test plan

• Full local build on this branch: julia --project=docs docs/make.jl completes with exit code 0 and renders the whole site (35 MB in docs/build). No Error: lines remain; only pre-existing warnings (missing_docs, docs_block, size-threshold notices).
• Verified in the rendered HTML that the previously broken sections now have content: ExplicitTaylor2 on api/ordinarydiffeq/explicit/TaylorSeries/, GlobalRichardson on api/ordinarydiffeq/globalerrorcontrol/GlobalDiffEq/, and the AutoForwardDiff/AbstractColoringAlgorithm autodocs output on api/ordinarydiffeq/api/common_interface/.
• linkcheck passes with no 4xx/5xx errors.
• Confirm the Documentation workflow is green on CI.

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