[timeseries] Fix windows platform tests logfile permission error

[AnirudhDagar]

Issue #, if available:
Windows platform tests for timeseries are failing due to a permission error on removing a logfile that is being used by another process.

Description of changes:
This was introduced due to changes made in #3934 specifically these two lines were added to clean up the test directory (see comment: https://github.com/autogluon/autogluon/pull/3934/files#r1495459186). So this is a test specific fix for windows, and we skip removing the custom_log file in windows tests.:

autogluon/timeseries/tests/unittests/test_predictor.py

Lines 1090 to 1091 in 4de3056

	finally:
	log_path.unlink(missing_ok=True)

Thanks @shchur for helping setup the machine and sharing some context on the issue.

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[AnirudhDagar]

/platform_tests ref=ts_platform_test_fix
Platform Tests Output

[yinweisu]

Previous CI Run	Current CI Run

[canerturkmen]

Thanks @AnirudhDagar !!

[AnirudhDagar]

Remaining errors in timeseries windows platform tests are coming from test_chronos.py, due to the path generated incorrectly. I'm taking a look at that now, will send a separate fix for that.

[github-actions]

Job PR-4041-6751935 is done.
Docs are uploaded to http://autogluon-staging.s3-website-us-west-2.amazonaws.com/PR-4041/6751935/index.html