pipelines install-pipelines-cli: overwrite broken symlink pointing to old DB versions (#3356)

## Changes
Remove old symlink and add it pointing to new DB CLi .

## Why
When installing pipelines CLI after you have updated databricks, you
would still have the old symlink from pipelines CLI installed on your
machine. If that is the case, when you run install-pipelines-cli, the
old symlink would be overwritten to point to the new version of the DB
CLI.

## Tests
Updated install-pipelines-cli symlink test.

Author: alyssa-db

acceptance/pipelines/install-pipelines-cli/output.txt

@@ -1,7 +1,7 @@
 
 === install pipelines cli
 >>> [CLI] install-pipelines-cli -d ./subdir
-pipelines successfully installed in directory "./subdir"
+found existing pipelines installation at subdir/pipelines. Pipelines is successfully reinstalled in directory "./subdir"
 
 >>> ./subdir/pipelines
 Pipelines CLI
@@ -45,6 +45,43 @@ Exit code: 1
 
 === databricks executable called with alias
 >>> ./subdir/notdatabricks install-pipelines-cli -d ./subdir
+found existing pipelines installation at subdir/pipelines. Pipelines is successfully reinstalled in directory "./subdir"
+
+>>> ./subdir/pipelines
+Pipelines CLI
+
+Usage:
+  pipelines [command]
+
+Available Commands:
+  auth        Authentication related commands
+  completion  Generate the autocompletion script for the specified shell
+  deploy      Deploy pipelines
+  destroy     Destroy a pipelines project
+  dry-run     Validate correctness of the pipeline's graph
+  help        Help about any command
+  init        Initialize a new pipelines project
+  open        Open a pipeline in the browser
+  run         Run a pipeline
+  stop        Stop a pipeline
+  version     Retrieve information about the current version of the Pipelines CLI
+
+Flags:
+      --debug            enable debug logging
+  -h, --help             help for pipelines
+  -o, --output type      output type: text or json (default text)
+  -p, --profile string   ~/.databrickscfg profile
+  -t, --target string    project target to use (if applicable)
+      --var strings      set values for variables defined in project config. Example: --var="foo=bar"
+  -v, --version          version for pipelines
+
+Use "pipelines [command] --help" for more information about a command.
+
+=== overwrites broken symlink pointing to databricks
+>>> ./subdir/olddatabricks install-pipelines-cli -d ./subdir
+found existing pipelines installation at subdir/pipelines. Pipelines is successfully reinstalled in directory "./subdir"
+
+>>> [CLI] install-pipelines-cli -d ./subdir
 pipelines successfully installed in directory "./subdir"
 
 >>> ./subdir/pipelines

acceptance/pipelines/install-pipelines-cli/script

@@ -19,5 +19,13 @@ title "databricks executable called with alias"
 cp $CLI $tmpdir/notdatabricks
 trace $tmpdir/notdatabricks install-pipelines-cli -d $tmpdir
 trace $pipelines
+rm -f $pipelines
+
+title "overwrites broken symlink pointing to databricks"
+cp -L $CLI $tmpdir/olddatabricks
+trace $tmpdir/olddatabricks install-pipelines-cli -d $tmpdir
+rm -f $tmpdir/olddatabricks
+trace $CLI install-pipelines-cli -d $tmpdir
+trace $pipelines
 
 rm -rf $tmpdir/notdatabricks $pipelines $tmpdir

cmd/pipelines/install_pipelines_cli.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"runtime"
+	"strings"
 
 	"github.com/databricks/cli/libs/cmdio"
 	"github.com/spf13/cobra"
@@ -36,12 +38,25 @@ func installPipelinesSymlink(ctx context.Context, directory string) error {
 		if err != nil {
 			return err
 		}
-		cmdio.LogString(ctx, fmt.Sprintf("pipelines successfully installed in directory %q", dir))
+		cmdio.LogString(ctx, fmt.Sprintf("found existing pipelines installation at %s. Pipelines is successfully reinstalled in directory %q", pipelinesPath, dir))
 		return nil
 	}
 
 	target, err := filepath.EvalSymlinks(pipelinesPath)
 	if err != nil {
+		if strings.Contains(err.Error(), "databricks") &&
+			(strings.Contains(err.Error(), "no such file or directory") || (runtime.GOOS == "windows" && strings.Contains(err.Error(), "The system cannot find the file specified"))) {
+			err = os.Remove(pipelinesPath)
+			if err != nil {
+				return err
+			}
+			err = os.Symlink(realPath, pipelinesPath)
+			if err != nil {
+				return err
+			}
+			cmdio.LogString(ctx, fmt.Sprintf("pipelines successfully installed in directory %q", dir))
+			return nil
+		}
 		return err
 	}
 	if realPath == target {