Fix submit filters

[willemverspyck]

Subject

Closes #6865

Changelog

### Added
- Added `AbstractAdmin::mergeParameters()` to merge parameters but replace them when it's a subarray.

### Fixed
- Fix merge problem for filters with array value

[VincentLanglet]

Can you rebase in order to fix the conflict @willemverspyck ?

[SonataCI]

Could you please rebase your PR and fix merge conflicts?

[willemverspyck]

Rebase and fix the conflict is done. Only I'm still having a problem during testing that I don't know how to fix:

For example:

If I set the default values like this in the Admin class:

protected function configureDefaultFilterValues(array &$filterValues): void
{
    $filterValues['status'] = [
        'value' => [
            Content::STATUS_ACCEPT,
            Content::STATUS_DECLINE,
            Content::STATUS_REVIEW,
        ],
    ];
}

And you remove this "status" filter and click on "Filter", then the filter will be back, because you don't pass this filter anymore with the GET parameters, but they are retrieved again from the "configureDefaultFilterValues" method. How would you solve this? Maybe create separate issue for this.

[VincentLanglet]

Rebase and fix the conflict is done. Only I'm still having a problem during testing that I don't know how to fix:

For example:

If I set the default values like this in the Admin class:

protected function configureDefaultFilterValues(array &$filterValues): void
{
    $filterValues['status'] = [
        'value' => [
            Content::STATUS_ACCEPT,
            Content::STATUS_DECLINE,
            Content::STATUS_REVIEW,
        ],
    ];
}

And you remove this "status" filter and click on "Filter", then the filter will be back, because you don't pass this filter anymore with the GET parameters, but they are retrieved again from the "configureDefaultFilterValues" method. How would you solve this? Maybe create separate issue for this.

This is another issue indeed. This should be handled by the JS and I think it's already solved.
https://github.com/sonata-project/SonataAdminBundle/pull/6871/files#diff-8859a7d22354e11ba589b1f6d5b43b704276a2cbfe9899ecdd0ce0cb41e8dd63R341-R345
We now keep all the changed value.

[VincentLanglet]

Thanks @willemverspyck

[SonataCI]

Ok @phansys,

I requested a new release for SonataAdminBundle via Slack in #releases channel 👍

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