Configure OpenTelemetry programmatically

Configure OpenTelemetry programmatically rather than through environment variables or command-line flags. This creates a more maintainable and standardized approach to observability. Additionally, ensure all observability components like collectors are explicitly included in your deployment configurations.

Example:

# Preferred - Adding collector to Docker Compose services
services: "${{ format('{0}\notel-collector', join(matrix.containers, '\n')) }}"

# Avoid passing as environment variables
# make OTEL=true functional-test-coverage  # Not recommended

This approach ensures consistent observability setup across environments and makes configuration changes more traceable through source control.