REPL: make interactive precompiles test more robust

[IanButterworth]

Seems this test has become flaky https://buildkite.com/organizations/julialang/analytics/suites/julialang-base/tests/9edb60ba-fd1d-88fa-a5f0-205fa951d302?period=1day

So this tries to make it more robust.

FYI @tecosaur

[IanButterworth]

Still failing here.

[IanButterworth]

The issue on macOS x86 is we're hitting REPL precompilation...

From worker 4:	┌ Info: There was output before the julia prompt:
--
  | From worker 4:	│ [ Info: Precompiling REPL [3fa0cd96-eef1-5676-8a61-b3b8758bbffb] (cache misses: mismatched flags (1))
  | From worker 4:	│ Precompiling packages...
  | From worker 4:	│  214334.6 ms  ✓ REPL (serial)
  | From worker 4:	│   1 dependency successfully precompiled in 215 seconds
  |  
  | From worker 4:	┌ Info: REPL: trace compile output:
  | From worker 4:	│ precompile(Tuple{FileWatching.Pidfile.var"##mkpidlock#8", Base.Pairs{Symbol, Integer, Nothing, NamedTuple{(:stale_age, :wait), Tuple{Int64, Bool}}}, typeof(FileWatching.Pidfile.mkpidlock), Base.var"#__require_prelocked##0#__require_prelocked##1"{Base.PkgId, String, Base.Dict{String, Int64}}, String, Int32})
  | From worker 4:	│ precompile(Tuple{typeof(Base.CoreLogging.shouldlog), Base.CoreLogging.ConsoleLogger, Base.CoreLogging.LogLevel, Module, Symbol, Symbol})
  | From worker 4:	│ precompile(Tuple{typeof(Core.kwcall), NamedTuple{(:context,), Tuple{Nothing}}, typeof(Base.repr), Base.Multimedia.MIME{:var"text/plain"}, Base.PkgId})
  | From worker 4:	│ precompile(Tuple{typeof(Base.isopen), Base.GenericIOBuffer{Memory{UInt8}}})
  | From worker 4:	│ precompile(Tuple{Type{Base.IOContext{IO_t} where IO_t<:IO}, Base.GenericIOBuffer{Memory{UInt8}}, Base.TTY})
  | From worker 4:	│ precompile(Tuple{typeof(Base.write), Base.TTY, Array{UInt8, 1}})
  | From worker 4:	│ precompile(Tuple{typeof(Base.Precompilation.can_fancyprint), Base.TTY})
  | From worker 4:	│ precompile(Tuple{Base.Precompilation.var"##precompilepkgs#9", Bool, Bool, Bool, Bool, Bool, Pair{Base.Cmd, Base.CacheFlags}, Base.TTY, Bool, Bool, Bool, typeof(Base.Precompilation.precompilepkgs), Array{Base.PkgId, 1}})
  | From worker 4:	│ precompile(Tuple{typeof(Base.iterate), Array{Base.PkgId, 1}})
  | From worker 4:	│ precompile(Tuple{typeof(Base.haskey), Base.Dict{Base.PkgId, Array{Base.PkgId, 1}}, Base.PkgId})
  | From worker 4:	│ precompile(Tuple{typeof(Base.iterate), Array{Base.PkgId, 1}, Int64})
  | From worker 4:	│ precompile(Tuple{typeof(Base.Precompilation.printpkgstyle), Base.IOContext{IO}, Symbol, String})
  | From worker 4:	│ precompile(Tuple{typeof(Base.lock), Base.TTY})
  | From worker 4:	│ precompile(Tuple{typeof(Base.unlock), Base.TTY})
  | From worker 4:	└ precompile(Tuple{typeof(Base.println), Base.IOContext{IO}, String, String, Vararg{String}})

[vtjnash]

SGTM