34588 fix Simple product position in Groped product after delete simple product

[SilinMykola]

Description (*)

In this PR I fixed an error on grouped product edit page in the admin panel. When you try to remove some simple product (not the first), the Magento moves the first product to another position.
The problem is related to this check:

magento2/app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows.js

Line 955 in 2cb012b

if (!rec.position) {

I think it's added to set position if a product doesn't have some position. I added a check to ignore the product with a position equal to zero.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes When removing a Simple Product from a Grouped Product, the first product is moved near the end of the list #34588

Manual testing scenarios (*)

1. Create a Grouped Product and add at least four Simple Products
2. Save the Grouped Product.
3. Edit the Grouped Product and remove one of the Simple Products (not the first one at position 0)

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[SilinMykola]

@magento run all tests

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[SilinMykola]

@magento run Functional Tests EE, Functional Tests B2B

[magento-automated-testing]

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