[TEP-0050] Add Ignore Task Failure to alpha table

[QuanZhang-William]

Changes

This commit adds "Ignore Task Failure" to the alpha feature table.

/kind documentation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

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Release Notes

NONE

[QuanZhang-William]

/retest

[QuanZhang-William]

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Yongxuanzhang

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[dibyom]

/lgtm