Update ruff controls

[pp-mo]

A follow-on to #568 , mainly to ditch the separate .ruff.toml file,
as suggested in the developing 'repo common standards' wiki here

This should get iris-grib up-to-date with all the existing standards for the qa sprint

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.60%. Comparing base (a9d656c) to head (2768265).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #572   +/-   ##
=======================================
  Coverage   89.60%   89.60%           
=======================================
  Files           8        8           
  Lines        2473     2473           
  Branches      420      420           
=======================================
  Hits         2216     2216           
  Misses        159      159           
  Partials       98       98           

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[ukmo-ccbunney]

Looks good!