Remove unused imports from protofiles

[msorens]

Describe the bug

Running compile_all_protobuf_components reports these warnings:

external/cds/cds.proto:10:1: warning: Import google/protobuf/struct.proto is unused.
external/cds/cds.proto:12:1: warning: Import protoc-gen-swagger/options/annotations.proto is unused.
external/event_feed/event_feed.proto:10:1: warning: Import external/common/response.proto is unused.
external/iam/v2/common/teams.proto:6:1: warning: Import protoc-gen-swagger/options/annotations.proto is unused.
interservice/authn/tokens.proto:3:1: warning: Import google/api/annotations.proto is unused.
interservice/compliance/jobs/jobs.proto:7:1: warning: Import google/api/annotations.proto is unused.
interservice/compliance/profiles/profiles.proto:6:1: warning: Import google/api/annotations.proto is unused.
interservice/compliance/reporting/reporting.proto:6:1: warning: Import google/api/annotations.proto is unused.
interservice/compliance/stats/stats.proto:6:1: warning: Import google/api/annotations.proto is unused.
interservice/compliance/version/version.proto:6:1: warning: Import google/api/annotations.proto is unused.
interservice/event_feed/event_feed.proto:7:1: warning: Import external/event_feed/request/event.proto is unused.
interservice/event_feed/event_feed.proto:8:1: warning: Import external/event_feed/response/event.proto is unused.
interservice/event_feed/event_feed.proto:9:1: warning: Import external/common/response.proto is unused.
interservice/infra_proxy/request/policyfiles.proto:6:1: warning: Import protoc-gen-swagger/options/annotations.proto is unused.
interservice/local_user/users.proto:3:1: warning: Import google/api/annotations.proto is unused.
interservice/nodemanager/manager/manager.proto:6:1: warning: Import google/api/annotations.proto is unused.
interservice/nodemanager/nodes/nodes.proto:7:1: warning: Import google/api/annotations.proto is unused.
interservice/teams/teams.proto:3:1: warning: Import google/api/annotations.proto is unused.

To Reproduce

Steps to reproduce the behavior:

• hab studio enter
• compile_all_protobuf_components

Expected behavior

No warnings

Aha! Link: https://chef.aha.io/epics/SH-E-468