Missing route_parameters when creating a link in code [#3548102]

Problem/Motivation

In the related issue a link is created in code, but it forgets to pass the route_parameters. So everything works fine for routes without parameters, but when route_parameters are needed, there are errors about missing required parameters (for example, a menu-link to the entity.node.canonical route)

Proposed resolution

Also pass the route_parameters in getUrlObject

Issue fork menu_item_extras-3548102

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3548102-missing-routeparameters-when changes, plain diff MR !49
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