internal/version: use gitCommit injection in version handling code (#25851)

This changes the CI build to store the git commit and date into package
internal/version instead of package main. Doing this essentially merges our
two ways of tracking the go-ethereum version into a single place, achieving
two objectives:

- Bad block reports, which use version.Info(), will now have the git commit
  information even when geth is built in an environment such as
  launchpad.net where git access is unavailable.

- For geth builds created by `go build ./cmd/geth` (i.e. not using `go run
  build/ci.go install`), git information stored by the go tool is now used
  in the p2p node name as well as in `geth version` and `geth
  version-check`.

internal/flags/helpers.go

@@ -20,15 +20,17 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/ethereum/go-ethereum/internal/version"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/urfave/cli/v2"
 )
 
 // NewApp creates an app with sane defaults.
-func NewApp(gitCommit, gitDate, usage string) *cli.App {
+func NewApp(usage string) *cli.App {
+	git, _ := version.VCS()
 	app := cli.NewApp()
 	app.EnableBashCompletion = true
-	app.Version = params.VersionWithCommit(gitCommit, gitDate)
+	app.Version = params.VersionWithCommit(git.Commit, git.Date)
 	app.Usage = usage
 	app.Copyright = "Copyright 2013-2022 The go-ethereum Authors"
 	app.Before = func(ctx *cli.Context) error {