[Core Contracts] Remove old common Metrics DTO and route constant

[lenny-goodell]

🚀 Feature Request

Relevant Package [REQUIRED]

This feature request is for old Metrics capability

Description [REQUIRED]

The old Metrics capability has been removed from all services

Describe the solution you'd like

I Remove all unused code related to the old Metrics capability

Old DTOs:

• https://github.com/edgexfoundry/go-mod-core-contracts/blob/main/dtos/common/metrics.go
• https://github.com/edgexfoundry/go-mod-core-contracts/blob/main/dtos/common/base.go#L95-L102

Constant:

• https://github.com/edgexfoundry/go-mod-core-contracts/blob/main/common/constants.go#LL105C9-L105C9

Client code:

• https://github.com/edgexfoundry/go-mod-core-contractsmain//clients/http/common.go#L38
• https://github.com/edgexfoundry/go-mod-core-contracts/main/clients/interfaces/common.go#L19
• https://github.com/edgexfoundry/go-mod-core-contracts/blob/main/clients/interfaces/general.go#L19
• https://github.com/edgexfoundry/go-mod-core-contracts/blob/main/clients/http/general.go#L37

Describe alternatives you've considered

Have you considered any alternative solutions or workarounds?