Add additional "can fail" and "timeout" fields to task groups

[eramongodb]

Refer to the Task Groups section of the "Project Configuration Files" page.

evergreen validate rejects a *_timeout_secs field of type str:

task_groups:
  - name: example
    setup_group_timeout_secs: "123"

ERROR: load project error(s): loading file '[...]': error unmarshalling yaml strict: yaml: unmarshal errors:
  line 3: cannot unmarshal !!str `123` into int

The field types therefore updated from Optional[Union[int, str]] to Optional[int] accordingly.

[namazgurbanovmdb]

Can we add this to the class doc as well? Also, out of curiousity, is there timeout_specs for teardown_group?

[eramongodb]

Can we add this to the class doc as well?

Apologies, teardown_group_can_fail_task is actually undocumented and invalid according to the EVG validator (which is a surprise to me). Filed DEVPROD-12438 (fixed link) and commented it out for now (similar approach to #40).

Is there timeout_secs for teardown_group?

Yes, there is a teardown_group_timeout_secs. Added for completeness.

[eramongodb]

DEVPROD-12438 clarified teardown_group_can_fail_task is deliberately unsupported due to implementation concerns and there are no plans to support it either. Removed the field entirely accordingly.

[namazgurbanovmdb]

LGTM

[eramongodb]

This PR recieved a LGTM several weeks ago but has not yet been merged. Is this blocked on anything?