Use cmdio logger to log bricks cmd execution errors (#348)

## Changes
Uses the cmdio logger to log the execution error

## Tests
Manually by making the root command return fake errors. Here is the
output:
```
shreyas.goenka@THW32HFW6T bricks % bricks bundle validate
Error: my foo error
```

```
shreyas.goenka@THW32HFW6T bricks % bricks bundle validate --progress-format=json
{
  "error": "my foo error"
}
```

---------

Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>

cmd/root/root.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/databricks/bricks/internal/build"
+	"github.com/databricks/bricks/libs/cmdio"
 	"github.com/databricks/bricks/libs/log"
 	"github.com/spf13/cobra"
 	"golang.org/x/exp/slog"
@@ -23,6 +24,9 @@ var RootCmd = &cobra.Command{
 	// The usage string is include in [flagErrorFunc] for flag errors only.
 	SilenceUsage: true,
 
+	// Silence error printing by cobra. Errors are printed through cmdio.
+	SilenceErrors: true,
+
 	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 		ctx := cmd.Context()
 
@@ -64,6 +68,11 @@ func Execute() {
 
 	// Run the command
 	cmd, err := RootCmd.ExecuteContextC(ctx)
+	if err != nil {
+		// If cmdio logger initialization succeeds, then this function logs with the
+		// initialized cmdio logger, otherwise with the default cmdio logger
+		cmdio.LogError(cmd.Context(), err)
+	}
 
 	// Log exit status and error
 	// We only log if logger initialization succeeded and is stored in command

libs/cmdio/error_event.go

@@ -0,0 +1,15 @@
+package cmdio
+
+import "fmt"
+
+type ErrorEvent struct {
+	Error string `json:"error"`
+}
+
+func (event *ErrorEvent) String() string {
+	return fmt.Sprintf("Error: %s", event.Error)
+}
+
+func (event *ErrorEvent) IsInplaceSupported() bool {
+	return false
+}

libs/cmdio/logger.go

@@ -64,6 +64,16 @@ func LogString(ctx context.Context, message string) {
 	})
 }
 
+func LogError(ctx context.Context, err error) {
+	logger, ok := FromContext(ctx)
+	if !ok {
+		logger = Default()
+	}
+	logger.Log(&ErrorEvent{
+		Error: err.Error(),
+	})
+}
+
 func Ask(ctx context.Context, question string) (bool, error) {
 	logger, ok := FromContext(ctx)
 	if !ok {