libs/python: Remove DetectInterpreters (#2234)

## Changes
- Remove DetectInterpreters from DetectExecutable call: python3 or
python should always be on on the PATH. We don't need to detect
non-standard situations like python3.10 is present but python3 is not.
- I moved DetectInterpreters to cmd/labs where it is still used.

This is a follow up to #2034

## Tests
Existing tests.

Author: denik

cmd/labs/project/installer.go

@@ -15,7 +15,6 @@ import (
 	"github.com/databricks/cli/libs/databrickscfg/profile"
 	"github.com/databricks/cli/libs/log"
 	"github.com/databricks/cli/libs/process"
-	"github.com/databricks/cli/libs/python"
 	"github.com/databricks/databricks-sdk-go"
 	"github.com/databricks/databricks-sdk-go/service/compute"
 	"github.com/databricks/databricks-sdk-go/service/sql"
@@ -223,7 +222,7 @@ func (i *installer) setupPythonVirtualEnvironment(ctx context.Context, w *databr
 	feedback := cmdio.Spinner(ctx)
 	defer close(feedback)
 	feedback <- "Detecting all installed Python interpreters on the system"
-	pythonInterpreters, err := python.DetectInterpreters(ctx)
+	pythonInterpreters, err := DetectInterpreters(ctx)
 	if err != nil {
 		return fmt.Errorf("detect: %w", err)
 	}

libs/python/interpreters.go cmd/labs/project/interpreters.golibs/python/interpreters.go renamed to cmd/labs/project/interpreters.go

@@ -1,4 +1,4 @@
-package python
+package project
 
 import (
 	"context"

libs/python/interpreters_unix_test.go …d/labs/project/interpreters_unix_test.golibs/python/interpreters_unix_test.go renamed to cmd/labs/project/interpreters_unix_test.go libs/python/interpreters_unix_test.go renamed to cmd/labs/project/interpreters_unix_test.go

@@ -1,6 +1,6 @@
 //go:build unix
 
-package python
+package project
 
 import (
 	"context"

libs/python/interpreters_win_test.go cmd/labs/project/interpreters_win_test.golibs/python/interpreters_win_test.go renamed to cmd/labs/project/interpreters_win_test.go

@@ -1,6 +1,6 @@
 //go:build windows
 
-package python
+package project
 
 import (
 	"context"