[QoS][Solana] Disqualify endpoints with recent non-JSONRPC response (#406)

## Summary

Add JSON-RPC response validation error tracking for Solana endpoints

### Primary Changes:

- Created new JsonRpcResponseValidationError protobuf message to capture
validation errors with error types and timestamps
- Enhanced SolanaUnrecognizedResponse to include optional validation
error information
- Modified Solana endpoint validation to reject endpoints with recent
validation errors (within 30-minute window)

### Secondary Changes:

- Updated responseGeneric to track and include validation errors in
observations
- Added error handling for non-JSON-RPC responses with appropriate error
codes and timestamps
- Enhanced endpoint observation processing to update latest validation
errors from unrecognized responses

## Issue

Endpoints with non-JSONRPC response should be disqualified.

- Issue or PR: #{ISSUE_OR_PR_NUMBER}

## Type of change

Select one or more from the following:

- [x] New feature, functionality or library
- [ ] Bug fix
- [ ] Code health or cleanup
- [ ] Documentation
- [ ] Other (specify)

## QoS Checklist

### E2E Validation & Tests

- [ ] `make path_up`
- [ ] `make test_e2e_evm_shannon`

### Observability

- [ ] 1. `make path_up`
- [ ] 2. Run the following E2E test: `make
test_request__shannon_relay_util_100`
- [ ] 3. View results in LocalNet's [PATH Relay Grafana
Dashboard](http://localhost:3003/d/relays/path-service-requests)

## Sanity Checklist

- [x] I have updated the GitHub Issue `assignees`, `reviewers`,
`labels`, `project`, `iteration` and `milestone`
- [ ] For docs, I have run `make docusaurus_start`
- [ ] For code, I have run `make test_all`
- [ ] For configurations, I have updated the documentation
- [ ] I added `TODO`s where applicable

---------

Co-authored-by: Daniel Olshansky <[email protected]>

Author: adshmh

observation/qos/jsonrpc.pb.go

@@ -22,11 +22,12 @@ message JsonRpcResponse {
   // Must match the id value from the corresponding request
   string id = 1;
 
-  // JSON-serializable response data
-  string result = 2;
+  // A preview of the JSONRPC response's `result` field.
+  // It may have been truncated to reduce message size.
+  string result_preview = 2;
 
   // Error details, if the request failed
-  optional JsonRpcResponseError err = 3;
+  optional JsonRpcResponseError error = 3;
 
   // Note: This message captures only essential JSON-RPC fields.
   // Add fields as needed.
@@ -42,4 +43,4 @@ message JsonRpcResponseError {
 
   // Human-readable error description
   string message = 2;
-}
+}