docs: Clarify what the Force sync option does

[lindhe]

This change attempts to clarify what exactly the Force sync option does.

I have a handful of issues with the current description:

• Most of all, I would really like to know if the Force sync option corresponds to the --force flag in kubectl. If it does, then we should probably warn the user that there may be unintended consequences such as the pod being deleted from Kubernetes but the containers keep running on the node. If it does not, I think we should clarify that so users (like me) aren't too afraid to use it.
• To some degree, I think the current description is very vague and it would be more helpful if we clarified it.
• There is no example of only setting Force=true, only an example setting both Force=true and Replace=true. Does it not make sense to use only Force=true? I think it does! We should clarify the use-case for this.

I opened a PR rather than discussing in an Issue first, because I think it's easier to reason about texts if we see the suggested change in front of us.

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[lindhe]

Please note: my initial suggestion here is not intended to be the end-result if we merge this PR. But I need to discuss this and get some input before I can improve the suggested change.

[todaywasawesome]

The force flag on sync option bypasses graceful deletion in the same way kubectl --force does but force also does a delete and replace on all other items.

Thanks to #8574 we have a warning in the UI about doing force deletion which reads "The resources will be synced using '--force' that is a potentially destructive action and will immediately remove resources from the API and bypasses graceful deletion. Immediate deletion of some resources may result in inconsistency or data loss. Are you sure you want to continue?"

Another relevant discussion on the topic is in #5172

[lindhe]

The force flag on sync option bypasses graceful deletion in the same way kubectl --force does but force also does a delete and replace on all other items.

Thanks to #8574 we have a warning in the UI about doing force deletion which reads "The resources will be synced using '--force' that is a potentially destructive action and will immediately remove resources from the API and bypasses graceful deletion. Immediate deletion of some resources may result in inconsistency or data loss. Are you sure you want to continue?"

Another relevant discussion on the topic is in #5172

That's great, thank you for the details! I'll review the details in the links you sent and see if that can be incorporated into the docs.

[lindhe]

I would like some clarification on two details, before I know what to write:

The force flag on sync option bypasses graceful deletion in the same way kubectl --force does

I assume you mean kubectl apply --force? Or is it kubectl create --force?

but force also does a delete and replace on all other items.

Does it really do delete and replace, even when Replace=false??

And also: on all other items?? I tried running it, I don't think it seems like it touches any other resources than the one with annotation argocd.argoproj.io/sync-options: Force=true. Or am I misinterpreting you?

[lindhe]

I've split the section in two now, to distinguish between Force=true and Force=true,Replace=true. As soon as you have helped me understand the points I asked about, I'll do one last change and then I think this is ready for review.