Revert event loop related changes

[shangm2]

Description

1. we see some issues at certain clusters where workers are not receiving any splits. Reverting the following two prs back to unblock others so I can take time to root cause it.
   a. Use a wrapper for event loop to handle exceptions gracefully #24412
   b. Assign event loop to tasks and run a task's methods in the same loop #24288

Motivation and Context

1. reverting event loop related changes to unblock others.

Impact

Test Plan

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[jainxrohit]

Thank you Shang!

[rschlussel]

thanks @shangm2 can you fix the merge conflict?

FYI @ZacBlanco this change was in the 0.291 release. We're still investigating, but that release may need to be patched.

[arhimondr]

We are still investigating the problem. There is a chance it could be related to differences in configuration on our side. Let's hold on with the revert for now.