refactor(context): Update Ctx Event Manager modifier to take interface

[calbera]

Description

Followup to #14384, one-liner necessary change
Allows chains to modify the context event manager with their own

@itsdevbear

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[itsdevbear]

tldr we're goofies

[julienrbrt]

Could you please rebase, or allow maintainer to do so?

[tac0turtle]

replacing with #14418 to get it merged