Unify Push Model structures time formats to UTC

[sarroutbi]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.36%. Comparing base (c7da96f) to head (472a4cc).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
e2e-testsuite	69.36% <ø> (ø)
upstream-unit-tests	69.36% <ø> (ø)

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Files with missing lines	Coverage Δ
keylime-push-model-agent/src/struct_filler.rs	100.00% <ø> (ø)
keylime/src/structures/capabilities_negotiation.rs	71.42% <ø> (ø)
keylime/src/structures/evidence_handling.rs	81.25% <ø> (ø)

... and 2 files with indirect coverage changes

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