deprecate field_of_fractions(O::GenOrd)

[felix-roehrich]

A quick search shows that field_of_fractions isn't used anywhere, but causes confusion with fraction_field used in OSCAR and co.
I am not sure if simply removing or offering fraction_field as an alias of function_field is better. For now I think it is best to deprecate field_of_fractions.

[thofma]

Looks good. Could you move the deprecation to https://github.com/thofma/Hecke.jl/blob/master/src/Deprecations.jl? Thanks.

[felix-roehrich]

Done.

[felix-roehrich]

Please approve the workflows.

[felix-roehrich]

"Run long tests" timed out. But I guess this still can be merged, since ~1.10.0 is failing anyway ?

[thofma]

I have restarted it.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (41b61f3) 74.59% compared to head (c426b72) 74.51%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1240      +/-   ##
==========================================
- Coverage   74.59%   74.51%   -0.08%     
==========================================
  Files         346      346              
  Lines      110839   110837       -2     
==========================================
- Hits        82681    82592      -89     
- Misses      28158    28245      +87     

Files	Coverage Δ
src/Deprecations.jl	4.54% <ø> (ø)
src/FunField/Divisor.jl	80.08% <ø> (+0.68%)	⬆️

... and 36 files with indirect coverage changes

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