ucsi: Reduce zeros in test constants

[RobertZ2011]

Reduce the number of zeros used in test constants to make tests more robust in detecting regressions in field layouts.

[Copilot]

Pull request overview

Reduces the use of all-zero byte patterns in UCSI-related tests so the tests are more likely to catch regressions in bit/field layout and byte placement.

Changes:

• Updates CommandHeader decoding tests to use a non-zero data_len byte.
• Updates GET_ERROR_STATUS response-data test to use non-zero vendor bytes and matching raw byte expectations.
• Updates GET_CONNECTOR_STATUS response-data test to set non-zero connector partner flags and corresponding raw bit placements.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/ucsi/mod.rs	Uses a non-zero data_len in command-header decoding tests to better validate field decoding.
src/ucsi/lpm/get_error_status.rs	Replaces mostly-zero vendor test bytes with distinct values and updates the expected raw layout accordingly.
src/ucsi/lpm/get_connector_status.rs	Sets non-zero partner_flags and updates expected raw bits to ensure partner-flag packing is exercised.