fix(smus): Fix potential race condition bug on getting context

[vpbhargav]

Description

We were seeing intermittent issues where sometimes the context was being returned as undefined.

Setting it at the start of the activation to ensure the the context is available always.

Motivation

Bug fix

Testing Done

Tested manually locally.

Problem

Solution

---

• 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.
• License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

[amazon-inspector-ohio]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
  • Note: beta or "experiment" features that have active users should announce fixes in the changelog.
  • If this is not a feature or fix, use an appropriate type from the title guidelines. For example, telemetry-only changes should use the telemetry type.

[amazon-inspector-ohio]

✅ I finished the code review, and didn't find any security or code quality issues.

[bharathGuntamadugu]

Hours of effort for this change. :). Lets also make sure that this is going through for LocalIDE now.

[vpbhargav]

/retryTests

[vpbhargav]

Failing unit tests in build are unrelated to PR

" 1 failing

1. AppBuilder Walkthrough
   Create project
   start with an existing template
   override existing template
   download serverlessland proj:
   Error: Test length exceeded max duration: 30 seconds
   [No Pending UI Elements Found]
   at Timeout._onTimeout (/Users/runner/work/aws-toolkit-vscode/aws-toolkit-vscode/packages/core/src/test/setupUtil.ts:46:32)
   at listOnTimeout (node:internal/timers:588:17)
   at processTimers (node:internal/timers:523:7)
   "

and

" 1 failing

1. Notifications Rendering
   executes updateAndReload type button:
   Error: Could not find the specified item "Update and Reload" on message: severity: Error, message: Webview error, items: View Logs..."