public/api-v2/issue-type/Invoke-JiraDeleteIssueTypeProperty.ps1

#https://developer.atlassian.com/cloud/jira/platform/rest/v2/#api-rest-api-2-issuetype-issueTypeId-properties-propertyKey-delete
function Invoke-JiraDeleteIssueTypeProperty {
    [CmdletBinding()]
    param (
        # The issue type ID
        [Parameter(Mandatory,Position=0)]
        [string]
        $IssueTypeId,

        # The key for the property to set
        [Parameter(Mandatory,Position=1)]
        [string]
        $PropertyKey,

        # The JiraContext object to use for the request
        [Parameter()]
        [JiraContext]
        $JiraContext
    )
    process {
        $functionPath = "/rest/api/2/issuetype/$IssueTypeId/properties/$PropertyKey"
        $verb = "DELETE"

        $method = New-Object RestMethod @($functionPath,$verb)
        $method.Invoke($JiraContext)
    }
}