[image-builder] Introduce retry for all resolver requests (timeout 15s, up to 3 times) for all network-related issues (#20868)

* [image-builder] Fix generate.sh

* [image-builder-api] Add use_retry_client to ResolveBaseImageRequest and BuildRequest

* [image-builder] Use req.GetUseRetryClient() instead of feature flag resolved on startup

[image-builder] Drop superfluous imports

[image-builder] Switch to github.com/hashicorp/go-retryablehttp, incl. better unit tests at orchestrator level!

* [server] Pass "useRetryClient" on all requests to image-builder

Author: geropl

components/image-builder-api/generate.sh

@@ -19,8 +19,6 @@ install_dependencies
 go_protoc "$COMPONENTS_DIR"
 typescript_protoc "$COMPONENTS_DIR"
 
-go generate typescript/util/generate-ws-ready.go
-
 # cd go
 pushd go
 

components/image-builder-api/go/imgbuilder.pb.go

@@ -44,6 +44,7 @@ message BuildSourceDockerfile {
 message ResolveBaseImageRequest {
     string ref = 1;
     BuildRegistryAuth auth = 2;
+    bool use_retry_client = 3;
 }
 
 message ResolveBaseImageResponse {
@@ -53,6 +54,7 @@ message ResolveBaseImageResponse {
 message ResolveWorkspaceImageRequest {
     BuildSource source = 1;
     BuildRegistryAuth auth = 2;
+    bool use_retry_client = 3;
 }
 
 message ResolveWorkspaceImageResponse {
@@ -68,6 +70,7 @@ message BuildRequest {
     string triggered_by = 4;
     string supervisor_ref = 5;
     string base_image_name_resolved = 6;
+    bool use_retry_client = 7;
 }
 
 message BuildRegistryAuth {