Refactor RunConfigBuilder to implement Option pattern.

[blkt]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 42.50681% with 211 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.65%. Comparing base (dc79cf2) to head (3fbfa30).

Files with missing lines	Patch %	Lines
pkg/runner/config_builder.go	58.33%	104 Missing and 6 partials ⚠️
cmd/thv/app/run_flags.go	0.00%	40 Missing ⚠️
cmd/thv-proxyrunner/app/run.go	0.00%	28 Missing ⚠️
pkg/api/v1/workloads.go	0.00%	24 Missing ⚠️
pkg/mcp/server/run_server.go	18.18%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1721      +/-   ##
==========================================
+ Coverage   33.52%   33.65%   +0.13%     
==========================================
  Files         217      217              
  Lines       26885    26953      +68     
==========================================
+ Hits         9012     9070      +58     
- Misses      17207    17211       +4     
- Partials      666      672       +6     

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[coveralls]

coverage: 35.978% (+0.1%) from 35.876%
when pulling 3fbfa30 on chore/refactor-runconfig-builder-into-options
into dc79cf2 on main.