Clean up some more Global stuff

[sagudev]

Connections
Towards #5121

Description
In #9830 I discovered some stale profilling::scope and many doc comments still referring to Global so we replace those with methods on resources.

Testing
Just refactor/docs.

Squash or Rebase?

Rebase

Checklist

• I self-reviewed and fully understand this PR.
• WebGPU implementations built with wgpu may be affected behaviorally.
• Validation and feature gates are in place to confine behavioral changes.
• Tests demonstrate the validation and altered logic works.
• CHANGELOG.md entries for the user-facing effects of this change are present.
• The PR is minimal, and doesn't make sense to land as multiple PRs.
• Commits are logically scoped and individually reviewable.
• The PR description has enough context to understand the motivation and solution implemented.