[Ui] Allow to define listing configuration via ui component xml

[Den4ik]

Description (*)

Component paging settings allow to define pageSize and options via ui component xml. But defined variables are overridden in php and js.

Also removed unused variable from UiComponent generator

Fixed Issues (if relevant)

no related issue

Manual testing scenarios (*)

1. Create custom listing or edit exists
2. Add following code for paging configuration

        <paging name="listing_paging">
            <settings>
                <pageSize>30</pageSize>
                <options>
                    <option name="15" xsi:type="array">
                        <item name="label" xsi:type="string">15</item>
                        <item name="value" xsi:type="string">15</item>
                    </option>
                    <option name="30" xsi:type="array">
                        <item name="label" xsi:type="string">30</item>
                        <item name="value" xsi:type="string">30</item>
                    </option>
                    <option name="50" xsi:type="array">
                        <item name="label" xsi:type="string">50</item>
                        <item name="value" xsi:type="string">50</item>
                    </option>
                    <option name="100" xsi:type="array">
                        <item name="label" xsi:type="string">100</item>
                        <item name="value" xsi:type="string">100</item>
                    </option>
                </options>
            </settings>
        </paging>

3. Clear cache and bookmarks

Expected result

Expected that grid will show 15, 30, 50, 100 in size selector and 30 as default value

Actual result

20, 30, 50, 100, 200 available in size selector with 20 as default value

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)
• All automated tests passed successfully (all builds are green)

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[ghost]

@Den4ik unfortunately, only members of the maintainers team are allowed to add progress related labels to the pull request

[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-5310 has been created to process this Pull Request
✳️ @dmytro-ch, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

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After:

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