Fix URL.build not validating that path has a leading slash when passing authority

[bdraco]

What do these changes do?

Fix URL.build not validating that path has a leading slash when passing authority
The validation only worked when host was passed

Are there changes in behavior for the user?

Validation of leading / in path now works for authority instead of just host as intended

[codspeed-hq]

CodSpeed Performance Report

Merging #1265 will not alter performance

_{Comparing test_build_with_authority_fix (7983876) with master (5b3592a)}

Summary

✅ 49 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.74%. Comparing base (5b3592a) to head (7983876).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1265   +/-   ##
=======================================
  Coverage   95.74%   95.74%           
=======================================
  Files          27       27           
  Lines        5214     5219    +5     
  Branches      305      306    +1     
=======================================
+ Hits         4992     4997    +5     
  Misses        195      195           
  Partials       27       27           

Flag	Coverage Δ
CI-GHA	95.74% <100.00%> (+<0.01%)	⬆️
MyPy	44.11% <58.33%> (-0.03%)	⬇️
OS-Linux	99.24% <83.33%> (-0.05%)	⬇️
OS-Windows	99.30% <83.33%> (-0.05%)	⬇️
OS-macOS	98.96% <83.33%> (-0.05%)	⬇️
Py-3.10.11	98.93% <83.33%> (-0.05%)	⬇️
Py-3.10.15	99.19% <83.33%> (-0.05%)	⬇️
Py-3.11.10	99.19% <83.33%> (-0.05%)	⬇️
Py-3.11.9	98.93% <83.33%> (-0.05%)	⬇️
Py-3.12.7	99.19% <83.33%> (-0.05%)	⬇️
Py-3.13.0	99.19% <83.33%> (-0.05%)	⬇️
Py-3.9.13	98.89% <83.33%> (-0.05%)	⬇️
Py-3.9.20	99.15% <83.33%> (-0.05%)	⬇️
Py-pypy7.3.16	99.20% <83.33%> (-0.05%)	⬇️
Py-pypy7.3.17	99.22% <83.33%> (-0.05%)	⬇️
VM-macos-latest	98.96% <83.33%> (-0.05%)	⬇️
VM-ubuntu-latest	99.24% <83.33%> (-0.05%)	⬇️
VM-windows-latest	99.30% <83.33%> (-0.05%)	⬇️
pytest	99.24% <83.33%> (-0.05%)	⬇️

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[bdraco]

Could use another set of 👀 to make sure authority is supposed to have this validation. Would be very surprised if not since authority is in the validation message but maybe I'm missing something....

[bdraco]

slept on this one and much more confident the change is correct.