gitserver: grpc: create exhaustive logger for repository service

[ggilmore]

This PR builds on #61270, and adds the request logging funcionality to the repository grpc server in gitserver.

Test plan

Local testing:

Ran env SRC_GITSERVER_EXHAUSTIVE_LOGGING_ENABLED=true SRC_LOG_SCOPE_LEVEL=gitserver.gRPCRequestLogger=debug sg start locally, and saw the following output from the logger in my terminal (note that specifically the repository service is mentioned):

[    gitserver-0] DEBUG gitserver.gRPCRequestLogger internal/server_grpc_logger.go:46 Handled FetchRepository RPC {"server": "gitserver.v1.GitserverRepositoryService", "method": "FetchRepository", "status": "OK", "traceID": "67f1aa837367fa7ea72b164e70a67419", "duration": "1.068438833s", "request": {"repoName": "github.com/sgtest/megarepo"}}

[ggilmore]

• searcher: remove unused diff.ParseGitDiffNameStatus package #62363
• gitserver: grpc: remove now unused DiffSymbols func #62360
• worker: embeddings: replace usage of old gitserver.DiffSymbols client method with new gitserver.ChangedFiles method #62359
• searcher: replace usage of gitserver.DiffSymbols with new gitserver.ChangedFiles client method #62358
• symbols: replace usage of gitserver client's DiffSymbols method with new ChangedFiles method #62355
• gitserver: grpc: add new ChangedFiles method to gitserver client #62354
• gitserver: grpc: create changed files RPC implementation for gRPC server #62262
• gitserver: grpc: port DiffSymbols from client as new GitBackend.ChangedFiles() func #62252
• gitserver: grpc: swap client implementation of GetAheadBehind from Exec to bespoke gRPC endpoint #62217
• gitserver: grpc: create server implementation for GetBehindAhead #62216
• gitserver: grpc: port GetBehindAhead from client to gitcli backend #62212
• codeinsights: remove now useless empty repo string error check #62302
• gitserver: grpc: switch clientImplementor to use new dedicated gRPC method for FirstEverCommit #62173
• gitserver: grpc: create FirstEverCommit RPC method and server implementation #62169
• gitserver: port FirstEverCommit functionality from client to git cli backend #62165
• gitserver: grpc: create exhaustive logger for repository service #62158 👈
• main

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