[chore] switch over githubgen to the one built with our tools (#37397)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
Change the githubgen we use to the one defined in
opentelemetry-go-build-tools

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
See
#37294

Author: atoulme

Makefile

@@ -310,17 +310,13 @@ generate: install-tools
 	PATH="$$PWD/.tools:$$PATH" $(MAKE) for-all CMD="$(GOCMD) generate ./..."
 	$(MAKE) gofmt
 
-.PHONY: githubgen-install
-githubgen-install:
-	cd cmd/githubgen && $(GOCMD) install .
-
 .PHONY: gengithub
-gengithub: githubgen-install
-	githubgen
+gengithub: $(GITHUBGEN)
+	$(GITHUBGEN)
 
 .PHONY: gendistributions
-gendistributions: githubgen-install
-	githubgen distributions
+gendistributions: $(GITHUBGEN)
+	$(GITHUBGEN) distributions
 
 .PHONY: update-codeowners
 update-codeowners: gengithub generate
@@ -556,9 +552,8 @@ clean:
 	find . -type f -name 'builtunitetest.test' -delete
 
 .PHONY: generate-gh-issue-templates
-generate-gh-issue-templates:
-	cd cmd/githubgen && $(GOCMD) install .
-	githubgen issue-templates
+generate-gh-issue-templates: $(GITHUBGEN)
+	$(GITHUBGEN) issue-templates
 
 .PHONY: checks
 checks:

Makefile.Common

@@ -74,6 +74,7 @@ CHECKFILE           := $(TOOLS_BIN_DIR)/checkfile
 CROSSLINK           := $(TOOLS_BIN_DIR)/crosslink
 GOJUNIT             := $(TOOLS_BIN_DIR)/go-junit-report
 BUILDER             := $(TOOLS_BIN_DIR)/builder
+GITHUBGEN           := $(TOOLS_BIN_DIR)/githubgen
 GOFUMPT             := $(TOOLS_BIN_DIR)/gofumpt
 GOVULNCHECK         := $(TOOLS_BIN_DIR)/govulncheck
 GCI                 := $(TOOLS_BIN_DIR)/gci

internal/tools/go.mod

@@ -14,6 +14,7 @@ require (
 	go.opentelemetry.io/build-tools/checkfile v0.16.0
 	go.opentelemetry.io/build-tools/chloggen v0.16.0
 	go.opentelemetry.io/build-tools/crosslink v0.16.0
+	go.opentelemetry.io/build-tools/githubgen v0.0.0-20250120111601-b29324c2a9f5
 	go.opentelemetry.io/build-tools/issuegenerator v0.16.0
 	go.opentelemetry.io/build-tools/multimod v0.16.0
 	go.opentelemetry.io/collector/cmd/builder v0.118.1-0.20250121185328-fbefb22cc2b3
@@ -107,7 +108,8 @@ require (
 	github.com/golangci/unconvert v0.0.0-20240309020433-c5143eacb3ed // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/go-github v17.0.0+incompatible // indirect
-	github.com/google/go-querystring v1.0.0 // indirect
+	github.com/google/go-github/v66 v66.0.0 // indirect
+	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/gordonklaus/ineffassign v0.1.0 // indirect
 	github.com/gostaticanalysis/analysisutil v0.7.1 // indirect

internal/tools/go.sum

@@ -22,6 +22,7 @@ import (
 	_ "go.opentelemetry.io/build-tools/checkfile"
 	_ "go.opentelemetry.io/build-tools/chloggen"
 	_ "go.opentelemetry.io/build-tools/crosslink"
+	_ "go.opentelemetry.io/build-tools/githubgen"
 	_ "go.opentelemetry.io/build-tools/issuegenerator"
 	_ "go.opentelemetry.io/build-tools/multimod"
 	_ "go.opentelemetry.io/collector/cmd/builder"