internal/libs/asynclib: respect context deadline in WaitForAllNoErrOperations

[makramkd]

The Problem

Described in detail in the ticket. The short summary of it is that the plugin seems to hang for some nops in the chainfee.Processor's Observation method, which causes the entire observation to hang forever.

This causes participation to drop and alerts to fire. Other than that, we lose a participant in the DON which is not good.

The Solution

The plugin simply cannot allow Observation to hang for any reason; in order to achieve this, this PR updates the way WaitForAllNoErrOperations works:

• Introduce the ExecuteAsyncOperations which always respects the provided timeout - it abandons running goroutines that don't return within this timeout if necessary
• In order to avoid spawning new goroutines for the same hanging operation, we add another helper WrapWithSingleFlight that checks a sync.Map object prior to trying to run an operation again.
• In order to avoid data races where ExecuteAsyncOperations returns prior to all goroutines finishing, the operation now returns a value instead of updating a value in a closure.
• In order to more easily track what operations failed, UUIDs that represent an operation's execution are generated and used as fields in the logs.

[github-actions]

Metric	mk/CCIP-8540-2	main
Coverage	70.4%	69.6%