[pgAdmin4][Patch]: Using client-side 'url_for' implementation in the datagrid module

[Surinder Kumar]

Hi

Changes:

1. Replace Jinja {{ url_for }} with js 'url_for'

2. While minifying JS using webpack, the code to open QueryToolPanel and
DatagridPanel wasn't working. This is fixed.

Please find attached patch.

Thanks,
Surinder Kumar

url_for_datagrid.patch
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