[MM-28422] Enable processing of import files through API (#16062)

* Implement unzip function

* Implement FileSize method

* Implement path rewriting for bulk import

* Small improvements

* Add ImportSettings to config

* Implement ListImports API endpoint

* Enable uploading import files

* Implement import process job

* Add missing license headers

* Address reviews

* Make path sanitization a bit smarter

* Clean path before calculating Dir

* [MM-30008] Add mmctl support for file imports (#16301)

* Add mmctl support for import files

* Improve test

* Remove unnecessary handlers

* Use th.TestForSystemAdminAndLocal

* Make nouser id a constant

app/app.go

@@ -115,6 +115,9 @@ func (a *App) initJobs() {
 	if productNoticesJobInterface != nil {
 		a.srv.Jobs.ProductNotices = productNoticesJobInterface(a)
 	}
+	if jobsImportProcessInterface != nil {
+		a.srv.Jobs.ImportProcess = jobsImportProcessInterface(a)
+	}
 
 	if jobsActiveUsersInterface != nil {
 		a.srv.Jobs.ActiveUsers = jobsActiveUsersInterface(a)