loading overlay on form submit

[awaismusl]

i have added overlay loading on form submissions to prevent multiple form submission by mistake. for this we need to add "cortex-form-loading" class to each form elements of the application or where we need this

[qlty-cloud-legacy[bot]]

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[Omranic]

We will refactor the frontend, and this will be handled at a later stage; so closing this for now.