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fix: invalid metrics should not crash (#11010)

## About the changes
Properly awaits all submitted promises, preventing the node's main
process from seeing rejected & unawaited promises.

What's going on?
- The bulk metrics handler pushes `registerBackendClient` promises into
promises.
- The next step (`clientMetricsEnvBulkSchema.validateAsync`) throws for
invalid metrics (e.g., `appName: null`), so we jump to catch and return
400.
- Because the code never reaches `Promise.all(...)`, the previously
spawned promises are never awaited. Node later detects the rejected
`registerBackendClient` promise as an **unhandled rejection** and
crashes the process. If that promise hadn’t been rejected, there’d be no
crash, but with invalid input, it does reject.
- **Fix:** always await the spawned tasks (using `Promise.allSettled`)
so every rejection is observed, even when validation later throws.

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