fmt: check gosimports during pre-commit hooks (#29520)

`gosimports` is the preferred style for module imports and it is
enforced via CI. I've found that things often manage to drift so I've
taken the liberty to update our pre-commit hook to verify our imports
formatting before a change is committed.

Along with updating the formatting helper I've also run `make fmt` to
resolve any formatting drift that managed to make it into the codebase.

Signed-off-by: Ryan Cragun <me@ryan.ec>

tools/pipeline/internal/cmd/github_list_runs.go

@@ -12,9 +12,8 @@ import (
 	"time"
 
 	ghclient "github.com/google/go-github/v68/github"
-	"github.com/spf13/cobra"
-
 	"github.com/hashicorp/vault/tools/pipeline/internal/pkg/github"
+	"github.com/spf13/cobra"
 )
 
 var listGithubWorkflowRuns = &github.ListWorkflowRunsReq{}