feat(telemetry): inject dynamic service version from CI

[JoseSzycho]

Currently, the telemetry serviceVersion is hardcoded. This prevents us from accurately correlating observability data with specific deployed versions of the gateway.

graphql-gateway/src/gateway/telemetry/telemetry.ts

Line 23 in dd1197f

serviceVersion: '1.0.0',

We need to update the build process to inject the actual release version (e.g., git tag) into the application during the CI pipeline. This dynamic version should then be consumed by the OpenTelemetry configuration to ensure traces and metrics reflect the correct running version of the service.