[pkg/stanza] fix eventData format for Windows events

[swiatekm]

Description:
Resubmitting #20548 with the failing windowseventlogreceiver test fixed.

I've also changed the event data to be a map[string]interface{} instead of a map[string][string] - otherwise I'd get a string instead of a map in the receiver, which is something I don't entirely understand the reason for. I assume it has to do with stanza internals?

Link to tracking Issue: #20858

Testing:
The changed test is logically more correct now, as what we should really be checking is the event message rather than the data.

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[swiatekm]

The test failures seem to be due to #20877, I'll keep this as a draft and rebase once that's fixed.

[djaglowski]

Thanks @swiatekm-sumo, nice improvement.