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Store per-run logs on RunTracker (#11025)

### Problem

We would like to enable pants plugins to have programatic access to the logs emitted by pants during a run, so plugins can do useful analysis with those log entries.

### Solution

This PR adds a new method `retrieve_logs(self) -> List[str]` on the `RunTracker` subsystem, which returns a list of each log entry emitted during a given run. RunTracker generates this by creating a text file in the `.pants.d/run-tracker/pants_run_*` directory for a specific run, then passes this file path to the Rust logging system and writes log lines that it would log that per-run file.

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