[chore] Revert the switch over githubgen to the one built with our to…

…ols (open-telemetry#37409)

Reverts open-telemetry#37397.

PRs started to fail after open-telemetry#37397 got merged because of the codeowners
check action, because it runs `make githubgen-install` then calls the
`githubgen` tool.

I tried first fixing the CI check to run the new tool and it's giving
errors, which is already starting to affect new PRs and old ones that
get rebased:

```
/Users/douglas/code/opentelemetry-collector-contrib/.tools/githubgen
2025/01/22 11:43:55 codeowners are not members: Erog38, Frapschen, IbraheemA, JonathanWamsley, MovieStoreGuy, Mrod1598, NassimBtk, RichieSams, StefanKurek, VihasMakwana, adrielp, ag-ramachandran, akats7, alexvanboxel, ankitpa
tel96, antonblock, armstrmi, atingchen, atoulme, avadhut123pisal, bertysentry, braydonk, bryan-aguilar, carsonip, chan-tim-sumo, chrroberts-pure, codeboten, cparkins, cpheps, dashpole, dehaansa, dgoscn, edmocosta, eedorenko, 
erichsueh3, evan-bradley, fatsheep9146, fchikwekwe, gjanco, greatestusername, hughesjj, jacobmarble, jade-guiton-dd, jamesmoessis, jaronoff97, jmacd, joker-star-l, jsuereth, kasia-kujawa, khyatigandhi6, kongluoxing, liustanle
y, lquerel, mapno, mar4uk, marctc, martin-majlis-s1, mcardy, michalpristas, moh-osman3, mrsillydog, narcis96, nslaughter, pavankrish123, pcwiese, pjanotti, portertech, povilasv, psx95, pxaws, qiansheng91, rapphil, rnishtala-s
umo, rogercoll, samiura, schmikei, shabicheng, shalper2, sinkingpoint, smithclay, splunkericl, srprash, swiatekm, tamir-michaeli, tomaz-s1, wangzlei, yotamloe, zdaratom-s1
make: *** [gengithub] Error 1
```

I suggest that the new tool is introduced more gradually and is not used
in CI yet until it behaves exactly like the old one.

Makefile

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

Makefile.Common

@@ -74,7 +74,6 @@ 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

@@ -14,7 +14,6 @@ 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
@@ -108,8 +107,7 @@ 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-github/v66 v66.0.0 // indirect
-	github.com/google/go-querystring v1.1.0 // indirect
+	github.com/google/go-querystring v1.0.0 // 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/tools.go

@@ -22,7 +22,6 @@ 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"