Clarify metrics does include PR and CLI metrics now

[kathleenqin]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/copilot/concepts/copilot-usage-metrics/copilot-metrics#which-usage-is-included

What part(s) of the article would you like to see updated?

Copilot metrics recently released more telemetry support for CCR and CLI

We should update the customer-facing docs so that

• We remove CCA and CLI from the list as they are represented in our usage telemetry
• Provide a better transition in that section since data is not exclusively IDE anymore

Additional information

https://github.com/github/docs-internal/pull/59950

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[kathleenqin]

PR: https://github.com/github/docs-internal/pull/59950