test: Add the required unique_key when building a Request without an ID

[vdusek]

Master CI is red on every type-check and unit-test job: https://github.com/apify/apify-client-python/actions/runs/32821686073

Two PRs that each passed CI on their own conflict semantically once merged together:

• fix: Require unique_key and url in RequestBase, add RequestWithoutId #1030 made unique_key a required field on RequestBase.
• fix: percent-encode caller-supplied URL path segments #1025 added two tests that build Request(url='https://example.com') to assert update_request rejects a request with no ID.

In that order, the Request constructor now raises a pydantic ValidationError for the missing uniqueKey before update_request is ever reached — so ty reported 2 missing-argument diagnostics and both tests failed on the wrong exception.

Supplying the now-required unique_key makes the tests exercise what they were written for (the missing ID), not model validation.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.99%. Comparing base (3e333a0) to head (197e784).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1032      +/-   ##
==========================================
+ Coverage   91.81%   94.99%   +3.17%     
==========================================
  Files          58       58              
  Lines        5450     5450              
==========================================
+ Hits         5004     5177     +173     
+ Misses        446      273     -173     

Flag	Coverage Δ
integration	91.70% <ø> (-0.12%)	⬇️
unit	86.40% <ø> (?)

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