GEOPY-1029: Add datetime stamp to simpeg.log and simpeg.out file names

[domfournier]

GEOPY-1029 - Add datetime stamp to simpeg.log and simpeg.out file names

[Copilot]

Pull request overview

This PR standardizes inversion log artifact filenames (e.g., SimPEG.log) to be deterministic across runs, and updates related tests and directive configuration accordingly.

Changes:

• Switch inversion logger output from timestamped SimPEG_<timestamp>.log to fixed SimPEG.log (and delete any pre-existing file on start).
• Update ScaleMisfitMultipliers chi-factor output filename to fixed ChiFactors.log.
• Update gravity driver test expectations to reference the new fixed filenames.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
simpeg_drivers/driver.py	Write logs to SimPEG.log (fixed name), return Path from get_path, and remove any existing log at start.
simpeg_drivers/components/factories/directives_factory.py	Change chi-factor log output to ChiFactors.log (fixed name).
tests/run_tests/driver_grav_test.py	Update test to read SimPEG.log and assert workspace entities for SimPEG.log / SimPEG.out.

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[benk-mira]

See comment on simpeg pr, I think we should be warning