fix: Production Plan: load document defaults for plan items & remove name column from listview (backport #26584)

[mergify]

fixes #26566

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This is an automatic backport of pull request #26584 done by Mergify.

[mergify]

Cherry-pick of 69d88a9 has failed:

On branch mergify/bp/develop/pr-26584
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	both modified:   erpnext/manufacturing/doctype/production_plan/production_plan.py
	both modified:   erpnext/manufacturing/doctype/production_plan/production_plan_list.js

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