extension/tools/relnotes: delete unused tool

We revised our release notes generation plan.
Instead of relnotes that attempted to analyze commit messages,
we maintain the "Unreleased" section in CHANGELOG which can
be later promoted to the release note.

For #3531

Change-Id: I06bd3d85f40de75dbc892f01c4f37dbdd279b1b7
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/616680
kokoro-CI: kokoro <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Hongxiang Jiang <[email protected]>

Author: hyangah

extension/go.mod

@@ -7,40 +7,12 @@ toolchain go1.21.9
 require (
 	github.com/golang/vscode-go v0.0.0-00010101000000-000000000000
 	github.com/google/go-cmp v0.6.0
-	github.com/stamblerre/work-stats v0.0.0-20221215212512-f2f2cf51e506
-	golang.org/x/build v0.0.0-20240104151245-5535e355572c
 )
 
 require (
-	cloud.google.com/go/compute v1.23.0 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/go-github v17.0.0+incompatible // indirect
-	github.com/google/go-querystring v1.1.0 // indirect
-	github.com/google/s2a-go v0.1.4 // indirect
-	github.com/google/uuid v1.3.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.2.5 // indirect
-	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
-	github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect
-	github.com/stamblerre/sheets v0.0.0-20220322044539-54bdb620f700 // indirect
-	go.opencensus.io v0.24.0 // indirect
-	go4.org v0.0.0-20180809161055-417644f6feb5 // indirect
-	golang.org/x/crypto v0.16.0 // indirect
-	golang.org/x/exp v0.0.0-20230809094429-853ea248256d // indirect
 	golang.org/x/mod v0.20.0
-	golang.org/x/net v0.19.0 // indirect
-	golang.org/x/oauth2 v0.15.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
 	golang.org/x/sys v0.22.0 // indirect
 	golang.org/x/telemetry v0.0.0-20240712210958-268b4a8ec2d7 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/time v0.5.0 // indirect
-	google.golang.org/api v0.136.0 // indirect
-	google.golang.org/appengine v1.6.8-0.20221117013220-504804fb50de // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230807174057-1744710a1577 // indirect
-	google.golang.org/grpc v1.58.3 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
 )
 
 // For development, use the vscgo in the same repo.