Cancel migration API to cancel the running migration (#6653)

* added changes for the cancel migration API

Signed-off-by: Vinay Sharma <vsharma@chef.io>

* Added changes to update the status and clear off data

Signed-off-by: Kallol Roy <karoy@progress.com>

* Fixed SQL query

Signed-off-by: Kallol Roy <karoy@progress.com>

Co-authored-by: Kallol Roy <karoy@progress.com>

api/external/infra_proxy/migrations/migrations.proto

@@ -7,7 +7,6 @@ import "google/api/annotations.proto";
 import "external/annotations/iam/annotations.proto";
 
 import "external/infra_proxy/migrations/request/migrations.proto";
-
 import "external/infra_proxy/migrations/response/migrations.proto";
 
 service  InfraProxyMigration {
@@ -16,4 +15,10 @@ service  InfraProxyMigration {
         option (chef.automate.api.iam.policy).resource = "infra:infraServers";
         option (chef.automate.api.iam.policy).action = "infra:infraServers:get";
     };
+
+    rpc CancelMigration (infra_proxy.migrations.request.CancelMigrationRequest) returns (infra_proxy.migrations.response.CancelMigrationResponce) {
+        option (google.api.http).get = "/api/v0/infra/servers/{server_id}/migrations/cancel_migration/{migration_id}";
+        option (chef.automate.api.iam.policy).resource = "infra:infraServers:{server_id}:migrations:{migration_id}";
+        option (chef.automate.api.iam.policy).action = "infra:infraServers:get";
+    };
 }