Time correlation and CSV output use UTC and RFC 3339

[LelsersLasers]

• Note: RFC 3339 is "internet-friendly" profile of ISO 8601
• Time correlation: previously converted GPS times (which are in UTC) to Local and then converted to unix timestamps which is potentially error prone and not our intended final output
• Output (CSV real time row): now outputs in RFC 3339 instead of a random format I hand made,
• Output (filenaming): Uses RFC 3339 but has the : replaced with - to be safe for use in a file name

[Copilot]

Pull request overview

Updates DAQ time correlation and CSV output to use UTC-based timestamps and RFC 3339 formatting, reducing ambiguity and avoiding unintended Local-time conversions.

Changes:

• Switch correlated timestamps from chrono::Local to chrono::Utc in the correlation function and GPS-point handling.
• Emit CSV “Real Time” values as RFC 3339 with millisecond precision.
• Use an RFC 3339-derived timestamp for output CSV filenames.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/daq_log_parse/table.rs	Updates filename and CSV “Real Time” formatting to RFC 3339 (millis).
src/daq_log_parse/correlate.rs	Changes correlation outputs to UTC and removes Local-time conversion in GPS correlation.

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