Only report initial status for events that will report status to SCM

[hennevogel]

Token::Workflow runs ScmInitialStatusReporter for all events. No matter if they will produce status or not. For instance for a pull_request/close hook. This will delete the project of the test build and never report anything again. No need for some initial status report...

@ailin-nemui reported that on IRC

This happens here:

open-build-service/src/api/app/models/token/workflow.rb

Lines 44 to 50 in 1ede08f

	SCMStatusReporter.new(@scm_webhook.payload, @scm_webhook.payload, scm_token, workflow_run, initial_report: true).call
	@workflows.each do |workflow|
	return workflow.errors.full_messages if workflow.invalid?(:call)
	workflow.call
	end
	SCMStatusReporter.new(@scm_webhook.payload, @scm_webhook.payload, scm_token, workflow_run, 'success', initial_report: true).call

[dmarcoux]

Report initial status only when needed