Google Spaces enhancement request for alerts/notifications

[tommyreilly]

Describe the feature

Please refer to the following slack thread:

https://github.com/fluxcd/flux2/discussions/4442#discussioncomment-7726046

What problem are you trying to solve?

Proposed solution

What do you want to happen? Add any considered drawbacks.

Any alternatives you've considered?

Is there another way to solve this problem that isn't as good a solution?