gitserver: grpc: swap client implementation of GetAheadBehind from Exec to bespoke gRPC endpoint

[ggilmore]

Closes #62101

This PR swaps the gitserver client implemenation of GetBehindAhead to use the new bespoke endpoint introduced in #62216 instead of the all-encompasing exec endpoint.

Test plan

• Unit tests

[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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[graphite-app]

Graphite Automations

"Post a GIF when PR approved" took an action on this PR • (05/02/24)

1 gif was posted to this PR based on Geoffrey Gilmore's automation.

[ggilmore]

Merge activity

• May 3, 1:18 PM EDT: Graphite rebased this pull request as part of a merge.
• May 3, 1:27 PM EDT: @ggilmore merged this pull request with Graphite.