OTLP GRPC support

[suyadav1]

This pull request updates the configuration for the AMACoreAgent's OpenTelemetry logging and upgrades the azure-mdsd package version in the Linux Kubernetes setup. The most important changes are grouped below:

OpenTelemetry configuration improvements:

• Replaces legacy PA_AMCS_* environment variables with new OTLP_HTTP_PROTOBUF_LOGS_TRACES_* and OTLP_GRPC_LOGS_TRACES_* variables for both host and port, providing clearer separation between HTTP/Protobuf and gRPC endpoints.
• Adds support for overriding both HTTP/Protobuf and gRPC ports via AZMON_OPENTELEMETRYLOGS_CONTAINER_PORT and AZMON_OPENTELEMETRYLOGS_CONTAINER_PORT_GRPC environment variables.
• Updates .bashrc to persist the new OTLP environment variables, and disables OTLP ports by setting them to -1 when OpenTelemetry logs are not enabled.

Dependency update:

• Upgrades the azure-mdsd package from version 1.40.3 to 1.42.0 in the setup.sh script to ensure the agent uses theversion which supports both http and grpc protocols in parallel.

Resource usage:

S.N. L2R	Image	Load	CPU usage	Mem usage
1	ciprod	50k EPS HTTP only	0.85 core	458 MiB
2	cidev	25k EPS HTTP + 25k EPS GRPC	1 core	512 MiB
3	cidev	50k EPS HTTP only	0.87 core	462 MiB
4	cidev	50k EPS GRPC only	0.95 core	500 MiB