style(clippy): use struct update syntax in create_work_item test

[github-actions]

What clippy found

error: field assignment outside of initializer for an instance created with Default::default()
   --> src/safe_outputs/create_work_item.rs:991:9
    |
991 |         config.description_field = Some(AdoWorkItemFieldRef::parse("System.Title").unwrap());
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: `-D clippy::field-reassign-with-default` implied by `-D warnings`

cargo clippy --all-targets --all-features --workspace -- -D warnings failed (exit 101) with this single finding in test_patch_field_validation_rejects_description_field_title_collision.

How it was fixed

• Lint: clippy::field_reassign_with_default
• Fix: replaced let mut config = CreateWorkItemConfig::default(); config.description_field = Some(...) with struct-update syntax (CreateWorkItemConfig { description_field: Some(...), ..Default::default() }), matching the pattern clippy suggests and avoids the redundant intermediate mutable default.
• File touched: src/safe_outputs/create_work_item.rs (test-only change, 4 insertions / 2 deletions)

Verification

• cargo build --all-targets — pass
• cargo test — 3229 passed, 0 failed (plus all other integration test binaries green)
• cargo clippy --all-targets --all-features --workspace -- -D warnings — exit 0, clean

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Generated by Clippy Fixer · auto · 50.6 AIC · ⌖ 7.7 AIC · ⊞ 13.1K · ◷

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