Update EXT_OS_Task.json to fix invalidBodyFormat errors

[anand-bhat]

Fixes an error when creating the view template caused by the presence of viewTemplateName and type properties which aren't supported.

Response: 400 Bad Request
{
    "code": "invalidBodyFormat",
    "message": "Invalid body format. Invalid format :Unrecognized field \"viewTemplateName\" (class ariba.reportingapi.rest.entities.ViewParameters), not marked as ignorable (5 known properties: \"status\", \"selectAttributes\", \"documentType\", \"filterExpressions\", \"variant\"])\n at [Source: (String)\"{\"viewTemplateName\":\"EXT_OS_Task\",\"type\":\"custom\",\"status\":\"published\",\"documentType\":\"Task\",\"selectAttributes\":[\"Status\",\"InternalId\",\"Owner\",\"ParentPlan\",\"Title\",\"CreateDate\",\"EndDate\",\"TimeUpdated\",\"BeginDate\",\"TemplateObject\",\"TimeCreated\",\"Active\",\"ParentWorkspace\",\"EndDateTime\",\"RoundNumber\",\"DueDate\"],\"filterExpressions\":[{\"name\":\"updatedDateTo\",\"field\":\"TimeUpdated\",\"op\":\"<=\",\"defaultValue\":null},{\"name\":\"updatedDateFrom\",\"field\":\"TimeUpdated\",\"op\":\">\",\"defaultValue\":null}]}\"; line: 1, column: 22] (through reference chain: ariba.reportingapi.rest.entities.ViewParameters[\"viewTemplateName\"])"
}

[cla-assistant]

All committers have signed the CLA.

[anand-bhat]

I've been using the views in the datasphere branch but this fix is also needed for this view in the main branch -- https://github.com/SAP-samples/btp-procurement-data-extractor/blob/main/resources/OperationalAPIView/Sourcing/EXT_OS_Task.json