Backport several changes from REPL.REPLCompletions

[Pangoraw]

• [REPLCompletions] suppress false positive field completions JuliaLang/julia#51502
• Don't give public but unexported symbols as repl completions in an unqualified context JuliaLang/julia#51345

[codecov-commenter]

Codecov Report

Merging #16 (51beb31) into master (f4b049e) will decrease coverage by 0.73%.
The diff coverage is 64.00%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   57.71%   56.98%   -0.73%     
==========================================
  Files           1        1              
  Lines         428      444      +16     
==========================================
+ Hits          247      253       +6     
- Misses        181      191      +10     

Flag	Coverage Δ
unittests	56.98% <64.00%> (-0.73%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/FuzzyCompletions.jl	56.98% <64.00%> (-0.73%)	⬇️

[Pangoraw]

I am not sure what should the return value of field_completion_eligible should be before 1.10, can the same method test be written ?

[fonsp]

@aviatesk Could you take a look when you have time?

[aviatesk]

Thanks!