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.
~~~

##### ACTUAL RESULTS

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there is no button to resume the template download;
~~~


Bắt đầu trong tab images/Templates/zones và tái hiện quá trình tải xuống bị gián đoạn theo các bước được liệt kê, bao gồm cả sự cố mạng. Xem xét luồng tải template hiện có và xác định cách cung cấp một lượt tải xuống được tiếp tục; công việc được coi là hoàn tất khi người dùng có thể nhấp vào "Resume Download" sau khi khôi phục và template tải xuống xong.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.