Fix ambiguity in remotecall_pool specialized for remotecall. Add test. Add Aqua tests.

[IanButterworth]

Fixes failure on julia CI JuliaLang/julia#57162
also adds the same ambiguity test here.

  | 2025-01-26 11:12:11 EST | ambiguous                                        (3) \|         failed at 2025-01-26T08:12:11.695
  | 2025-01-26 11:12:11 EST | Test Failed at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-94bacb2dc4/share/julia/test/ambiguous.jl:205
  | 2025-01-26 11:12:11 EST | Expression: isempty(detect_ambiguities(modules...; recursive = true, allowed_undefineds))
  | 2025-01-26 11:12:11 EST | Evaluated: isempty(Tuple{Method, Method}[(remotecall_pool(rc_f::typeof(remotecall), f, pool::AbstractWorkerPool, args...; kwargs...) @ Distributed /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-94bacb2dc4/share/julia/stdlib/v1.12/Distributed/src/workerpool.jl:140, remotecall_pool(rc_f, f, pool::CachingPool, args...; kwargs...) @ Distributed /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-94bacb2dc4/share/julia/stdlib/v1.12/Distributed/src/workerpool.jl:392), (kwcall(::NamedTuple, ::typeof(Distributed.remotecall_pool), rc_f::typeof(remotecall), f, pool::AbstractWorkerPool, args...) @ Distributed /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-94bacb2dc4/share/julia/stdlib/v1.12/Distributed/src/workerpool.jl:140, kwcall(::NamedTuple, ::typeof(Distributed.remotecall_pool), rc_f, f, pool::CachingPool, args...) @ Distributed /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-R17H3W25T9.0/build/default-honeycrisp-R17H3W25T9-0/julialang/julia-master/julia-94bacb2dc4/share/julia/stdlib/v1.12/Distributed/src/workerpool.jl:392)])
  | 2025-01-26 11:12:11 EST

[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.32%. Comparing base (2c0e979) to head (85ab2a2).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/workerpool.jl	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   79.26%   79.32%   +0.05%     
==========================================
  Files          10       10              
  Lines        1934     1949      +15     
==========================================
+ Hits         1533     1546      +13     
- Misses        401      403       +2     

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[IanButterworth]

This just needs approval to pass merge requirements.

[JamesWrigley]

LGTM!