fix: tensorboard sync for profiler data, Core API v2 managed mode [MLG-1063]

[ioga]

Description

• When tensorboard manager is in auto mode, automatically do the sync on closure. This should sync files written after the last metrics payload, e.g. native pytorch profiler traces.
• Core API v2 did not properly write tensorboard files while in managed mode.

Test Plan

• Run a managed core api experiment which uses pytorch profiling for the entire duration of the experiment, and make sure the trace is saved and can be accessed in the tensorboard. See tests for an example.
• Run Core API v2 experiment in a managed mode (i.e. as an experiment), and make sure tensorboard captures the metrics.

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

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[MikhailKardash]

LGTM