xds relay fetches incorrect eds resources

Snapshot of versioninfo on upstream envoymanager and xds relay.
We can observe that cache keys are not mapping correctly to the responses they contain in xds relay cache.

```
➜ ~ em exec --stdin --tty envoymanager-main-754f8c6b74-ck2pr -n envoymanager-staging --container envoymanager-service-gojson -- curl -s "0:6070/entry_dump?key=pyexample2_staging_eds" | head
[
{
"key": "pyexample2_staging_eds",
"version": "93efeb417a01422a7f856a1d14d70f2cbeefde0d",
"resource":
{
"clusterName": "pyexample2",
"endpoints": [
{
"locality": {
➜ ~ em exec --stdin --tty envoymanager-main-754f8c6b74-ck2pr -n envoymanager-staging --container envoymanager-service-gojson -- curl -s "0:6070/entry_dump?key=kitchensink_staging_eds" | head
[
{
"key": "kitchensink_staging_eds",
"version": "23878f15191ae03cdc018a012f2e5ddce2c2db40",
"resource":
{
"clusterName": "kitchensink",
"endpoints": [
{
"locality": {
➜ ~ em exec --stdin --tty envoymanager-main-754f8c6b74-ck2pr -n envoymanager-staging --container envoymanager-service-gojson -- curl -s "0:6070/entry_dump?key=pyexample2workers_staging_eds" | head
[
{
"key": "pyexample2workers_staging_eds",
"version": "d507920d74ddae6b002c24a899313aa656a78756",
"resource":
{
"clusterName": "pyexample2workers",
"endpoints": [
{
"locality": {
➜ ~ em exec --stdin --tty xdsrelay-main-7bfc54dd8f-xjbqt -n xdsrelay-staging --container xdsrelay-service-gojson -- curl -s 0:6070/cache/v3-pyexample2workers-staging-iad_eds | head
{
"Cache": [
{
"Key": "v3-pyexample2workers-staging-iad_eds",
"Resp": {
"VersionInfo": "23878f15191ae03cdc018a012f2e5ddce2c2db40",
"Resources": {
"Endpoints": [
{
"cluster_name": "kitchensink",
➜ ~ em exec --stdin --tty xdsrelay-main-7bfc54dd8f-xjbqt -n xdsrelay-staging --container xdsrelay-service-gojson -- curl -s 0:6070/cache/v3-pyexample2-staging-iad_eds | head
{
"Cache": [
{
"Key": "v3-pyexample2-staging-iad_eds",
"Resp": {
"VersionInfo": "d507920d74ddae6b002c24a899313aa656a78756",
"Resources": {
"Endpoints": [
{
"cluster_name": "pyexample2workers",
➜ ~ em exec --stdin --tty xdsrelay-main-7bfc54dd8f-xjbqt -n xdsrelay-staging --container xdsrelay-service-gojson -- curl -s 0:6070/cache/v3-kitchensink-staging-iad_eds | head
{
"Cache": [
{
"Key": "v3-kitchensink-staging-iad_eds",
"Resp": {
"VersionInfo": "93efeb417a01422a7f856a1d14d70f2cbeefde0d",
"Resources": {
"Endpoints": [
{
"cluster_name": "pyexample2",
➜ ~
```