Use withServices to detect early Monaco initialization

[colin-grant-work]

What it does

Fixes #17245 by using a targeted check to detect whether Monaco services had been initialized before our call to StandaloneServices.initialize

How to test

1. In the normal case, you should not see the log reported in Monaco new console error #17245
2. If you put a breakpoint after our call to StandaloneServices.initialize, you should see that isInitialized is true and servicesInitializedBeforeOverrides is false, since we have then initialized the services, but they hadn't been initialized before our call.

Follow-ups

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated.

Attribution

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines
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Reminder for reviewers

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[cdamus]

Does the job! I do have a nit for you to consider if you're keen.

[cdamus]

nit: If for whatever reason the private _services changes in a future release then serviceCollection may end up falsy. If we think we need to patch services but we don't get the collection we expect, then we silently fail to do anything. We should probably check that we got a ServicesCollection of the correct shape and log if not.