A button "resume download" is needed to finish-up template downloading under images/Templates/zones

##### ISSUE TYPE

* Improvement Request
* Enhancement Request

##### COMPONENT NAME

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UI
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##### CLOUDSTACK VERSION

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4.17.0.1
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##### CONFIGURATION

Advanced Networking

##### OS / ENVIRONMENT

RHEL-7.9

##### SUMMARY

While a template is being uploaded/pushed to a specific zone due to network issues the image/template was not fully downloaded onto that zone. Currently the download percentage is showing as 31%, and even though the management server was bounced yet the download is not getting completed and am looking for a button to resume the download but there is none.

##### STEPS TO REPRODUCE

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step1: Navigate to images/templates and click "Register template from URL"
step2: Fill-up the form to download the template to the desired zone and click OK
step3: While the template is being downloaded - due to network outages or the apache server where qcow2 templates are kept suddenly goes down this will interrupt the template downloading to a specific zone(s).
step4: Once the network outage is resolved, the user should be in a position to "resume download" on images/Templates/zones tab which is NOT available at the moment, hence creating this enhancement request
~~~

##### EXPECTED RESULTS

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As soon as the network issue is resolved, the user should be able to resume the template download by clicking "Resume Download" button.
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##### ACTUAL RESULTS

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there is no button to resume the template download;
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Inizia nella scheda images/Templates/zones e riproduci il download interrotto seguendo i passaggi elencati, inclusa l’interruzione della rete. Esamina il flusso esistente per il download dei template e determina come dovrebbe essere esposto un download ripreso; il lavoro è completato quando l’utente può fare clic su "Resume Download" dopo il ripristino e il template termina il download.

Scritto dal modello di indicizzazione a partire dal testo della issue.