Bump @vscode/extension-telemetry from 0.6.2 to 0.8.1

This major update bump removed two no longer necessary fields from the
constructor (as underneath the covers it now uses VS Code's telemetry
APIs, which we have access to now that our engine has bumped). It also
required a new "1DS" key instead of an "Application Insights" key which
I found by searching GitHub (after realizing it's reused).

Bumps [@vscode/extension-telemetry](https://github.com/Microsoft/vscode-extension-telemetry) from 0.6.2 to 0.8.1.
- [Release notes](https://github.com/Microsoft/vscode-extension-telemetry/releases)
- [Commits](microsoft/vscode-extension-telemetry@v0.6.2...v0.8.1)

---
updated-dependencies:
- dependency-name: "@vscode/extension-telemetry"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]