fix(server): resolve Jenkins unit-test regressions

[mbuckton]

Summary

• align Stickleback reposition tests with the intended ArduPlane GUIDED + guided-waypoint command sequence
• validate finite Stickleback mission altitude as supported
• serialize message-override QoS using the canonical enum name
• preserve absolute expiry when copying delayed messages by avoiding a second delay addition

Jira

• MSG-257
• MSG-261
• MSG-262

Tests

Targeted tests requested:

• SticklebackArdupilotUsvModelTest
• SticklebackArdupilotUsvModelMissionTest
• MessageOverrideConfigTest
• MessageOverridesTest
• MessageBuilderTest

Local Maven execution was attempted but dependency resolution was blocked because repository.mapsmessaging.io is not resolvable from the execution environment. git diff --check passes. Jenkins should provide authoritative verification.

Risk

Low. Stickleback changes are test-only. QoS serialization changes the stored representation from the descriptive enum toString() to the value accepted by valueOf(). Expiry reconstruction changes only message copies and preserves the original absolute expiry instead of extending it by the remaining delay.

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