CloudMigrations: Query Grafana Migration Status for status while the snapshot is in the cloud (#90314)

* implement querying gms for snapshot status

* add some documentation

* provide snapshot resources after snapshot is created

* add rate limiting to backend

* fix compilation error

* fix typo

* add unit tests

* finish merge

* lint

* swagger gen

* more testing

* remove duplicate test

* address a couple PR comments

* update switch statement to a map

* add timeouts to gms client through the http client

* remove extra whitespace

* put method back where it was so the PR is less confusing

* fix tests

* add todo

* fix final unit test

public/api-merged.json

@@ -15601,6 +15601,7 @@
             "PENDING_PROCESSING",
             "PROCESSING",
             "FINISHED",
+            "CANCELED",
             "ERROR",
             "UNKNOWN"
           ]
@@ -20369,6 +20370,7 @@
             "PENDING_PROCESSING",
             "PROCESSING",
             "FINISHED",
+            "CANCELED",
             "ERROR",
             "UNKNOWN"
           ]

public/openapi3.json

@@ -5697,6 +5697,7 @@
               "PENDING_PROCESSING",
               "PROCESSING",
               "FINISHED",
+              "CANCELED",
               "ERROR",
               "UNKNOWN"
             ],
@@ -10464,6 +10465,7 @@
               "PENDING_PROCESSING",
               "PROCESSING",
               "FINISHED",
+              "CANCELED",
               "ERROR",
               "UNKNOWN"
             ],