SNOW-1881731 Add p8 files to .gitignore

[sfc-gh-knozderko]

Description

SNOW-1881731 Add p8 files to .gitignore

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.33%. Comparing base (75532c9) to head (c7e5b4b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1093      +/-   ##
==========================================
- Coverage   86.37%   86.33%   -0.05%     
==========================================
  Files         132      132              
  Lines       12664    12664              
  Branches     1299     1299              
==========================================
- Hits        10939    10933       -6     
- Misses       1403     1405       +2     
- Partials      322      326       +4     

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