fix(sagemaker): Disable start/stop button for intermediate state of the space (aws#8282)

## Problem
- Users could click start/stop buttons on SageMaker spaces while they
were already in the process of starting or stopping.

## Solution
- Disables start/stop buttons when SageMaker space is in STARTING or
STOPPING state to prevent invalid operations during state transitions.
- Added pending state check in getContext() method
- Returns specific context values for pending states
(smusSpacePendingNode/awsSagemakerSpacePendingNode) in package.json
[openRemoteConnection]

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: bhavya2109sharma

packages/core/src/awsService/sagemaker/sagemakerSpace.ts

@@ -191,11 +191,15 @@ export class SagemakerSpace {
     public getContext(): string {
         const status = this.getStatus()
 
-        // only distinguish between running and non-running states
         if (status === SpaceStatus.RUNNING) {
             return 'awsSagemakerSpaceRunningNode'
         }
 
+        if (status === SpaceStatus.STOPPED) {
+            return 'awsSagemakerSpaceStoppedNode'
+        }
+
+        // For all other states (STARTING, STOPPING, etc.), return base context
         return this.isSMUSSpace ? 'smusSpaceNode' : 'awsSagemakerSpaceNode'
     }
 

packages/toolkit/package.json

@@ -1514,12 +1514,12 @@
                 {
                     "command": "aws.sagemaker.openRemoteConnection",
                     "group": "inline@1",
-                    "when": "view != aws.smus.rootView && viewItem =~ /^(awsSagemakerSpaceRunningNode|awsSagemakerSpaceNode)$/"
+                    "when": "view != aws.smus.rootView && viewItem =~ /^(awsSagemakerSpaceRunningNode|awsSagemakerSpaceStoppedNode)$/"
                 },
                 {
                     "command": "aws.smus.openRemoteConnection",
                     "group": "inline@1",
-                    "when": "view == aws.smus.rootView && viewItem =~ /^(awsSagemakerSpaceRunningNode|smusSpaceNode)$/"
+                    "when": "view == aws.smus.rootView && viewItem =~ /^(awsSagemakerSpaceRunningNode|awsSagemakerSpaceStoppedNode)$/"
                 },
                 {
                     "command": "_aws.toolkit.notifications.dismiss",