🧪 [Add missing test for L1CP code generation]

[shuwang1]

🎯 What: Added a missing unit test for L1CP code generation in GNSSCodesTests.swift.
📊 Coverage: Covered the happy path generation of the .L1CP code type for PRN 1.
✨ Result: Improved test coverage by verifying L1CP code generation is successful and returns the expected 20460 chips due to the internal BOC(1,1) modulation applied to the 10230-length base sequence.

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PR created automatically by Jules for task 2983449601749187651 started by @shuwang1

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