Use weak self captures for refcounted continuations

[jtolio]

Eventually I hope to enable the workerd-unsafe-continuation-capture linter.

These are easy fixes where we're capturing this and this references a refcounted object. We can capture a weak pointer instead of this.

[github-actions]

The generated output of @cloudflare/workers-types has been changed by this PR. If this is intentional, run just generate-types to update the snapshot. Alternatively, you can download the full generated types:

Full Type Diff

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