Version of components:
OpenShift version: 4.17.0-0.nightly-2024-07-20-191204
opentelemetry-operator.v0.104.0

Description of the problem:
When multiple OpenTelemetry collectors are created, we cannot select the collector instance from the OpenTelemetry Dashboard as the filter for Collector Instance drop-down lists collectors based on service_name, which is not unique. We can probably use service for the filter. For example I created two collector instances but only one service name otelcol is shown in the filter. 

When using service_name:

When using service for the filter:

Steps to reproduce the issue:
1. Install the OpenTelemetry Operator built off the latest upstream branch.

2. Create multiple collector instances with spec.enableMetrics: true

3. Check the Collector Instances filter in the OpenTelemetry Collector dashboard.