fix(core): use Date.now() everywhere for tasks start and end times to avoid negative durations

[AgentEnder]

Current Behavior

We use performance.now for start time and end time of tasks in the perf lifecycle hook, unless the tasks specify it (which is important for batch mode, when multiple tasks are reported at the same time but with different start and end times). Batch mode tasks report via Date.now instead, which can cause negative durations

Expected Behavior

No negative durations

Additional info

We decided to move away from performance.now here, partially because jest reports start and end time relative to UTC and it would be harder to compute.

Related Issue(s)

Closes #18388

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 11, 2023 8:01pm

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000 --parallel=1
• linux nx affected --target=test --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000 --parallel=1
• linux nx affected --target=build --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000 --parallel=3
• nx-cloud record -- nx format:check --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=356c3d968d63eac5a2937b25224b279d93ba1266 --head=2454ce1aa34e8a96fd3c2acea27781d24c36f000

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