patch(2.0): Nil check DPU extension timestamp error logging (#3744)

[hwadekar-nv]

Backports #3744 to release/v2.0.

Description:

• The timestamp parse branch was inverted, causing successful parses to log errors while failures were silent.
• The fix logs non-empty parse failures and preserves the existing fallback timestamp.
• Added coverage for valid and invalid timestamps, then ran the full dpuextensionservice package tests successfully.

Type of Change

• Fix - Bug fixes

Testing

• Unit tests added/updated

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🔍 Container Scan Summary

Service	Total	Critical	High	Medium	Low	Other
boot-artifacts-aarch64	3	0	0	3	0	0
boot-artifacts-x86_64	3	0	0	3	0	0
forge-admin-cli-x86_64	260	16	29	79	8	128
machine-validation-runner	548	41	117	191	18	181
machine_validation	548	41	117	191	18	181
machine_validation-aarch64	548	41	117	191	18	181
nvmetal-carbide	548	41	117	191	18	181
TOTAL	2458	180	497	849	80	852

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