Add stable-2.17 to CI; copy 2.17 ignore.txt files to 2.18

[felixfontein]

SUMMARY

Ref: https://forum.ansible.com/t/ansible-core-devel-bumped-to-2-18-0-dev0-stable-2-17-branch-created/4695

ISSUE TYPE

• Test Pull Request

COMPONENT NAME

CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.99%. Comparing base (a3fbe88) to head (8342fed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #275   +/-   ##
=======================================
  Coverage   82.99%   82.99%           
=======================================
  Files          32       32           
  Lines        4051     4051           
  Branches      873      873           
=======================================
  Hits         3362     3362           
  Misses        506      506           
  Partials      183      183           

Flag	Coverage Δ
integration	66.86% <ø> (ø)
sanity	22.08% <ø> (ø)
units	82.93% <ø> (ø)

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