Show scenario tags in gherkin terminal reporter

[baobaodawang-creater]

Adds scenario tag output to the gherkin terminal reporter when tags are present.

This prints tags in the requested format, for example:

(tags: R1.1, R1.2)

The change only affects tagged scenarios. Untagged scenarios keep the existing output.

Tests added:

• tagged scenario output for -v
• tagged scenario output for -vv
• guard that untagged scenario output does not include a tags line

Validation:

• python -m pytest tests/feature/test_gherkin_terminal_reporter.py -q --maxfail=1
• python -m pytest tests/feature -q --maxfail=1

Closes #476

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.13%. Comparing base (9454b38) to head (4f0312a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #807      +/-   ##
==========================================
+ Coverage   96.10%   96.13%   +0.02%     
==========================================
  Files          55       55              
  Lines        2390     2405      +15     
  Branches      136      138       +2     
==========================================
+ Hits         2297     2312      +15     
  Misses         56       56              
  Partials       37       37              

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