Record task start and end times for Acute-Evals

[EricMichaelSmith]

Patch description
Record HIT start and end times for Acute-Evals so that Mephisto's DataBrowser can access them. This will allow the Acute-Eval analysis script to record the task completion times properly. NOTE: the actual recording of the start and end times is in Mephisto, as part of facebookresearch/Mephisto#636 : this PR bumps the crowdsourcing CI check to use that update.

Testing steps
Existing tests have been updated to handle this change: the tests will discount the 'time_taken' and 'task_start' columns, which are now (correctly) variable from one run to the next

Testing that HIT times are now saved properly:

python parlai/crowdsourcing/tasks/acute_eval/run.py
mkdir -p ${DUMMY_SAVE_FOLDER}
python parlai/crowdsourcing/tasks/acute_eval/analysis.py -ids ${PRINTED_RUN_ID} --root-dir ${DUMMY_SAVE_FOLDER}

[JackUrb]

LGTM! Glad to have start and end times for these! These get_task_start and get_task_end functions are likely general enough to live in the underlying StaticAgentState though.

[EricMichaelSmith]

LGTM! Glad to have start and end times for these! These get_task_start and get_task_end functions are likely general enough to live in the underlying StaticAgentState though.

Good point @JackUrb - just opened up a PR for this at facebookresearch/Mephisto#636