Reduce windowseventlogreceiver tests flakiness

[pjanotti]

Description:
There are 3 main issues being addressed on this PR:

• There is a race between start and generating the events in the tests: the start require goroutines so a delay before generating the events will be advisable (not perfect but good enough per my tests)
• The tests assume that only the tests are generating events in that time window, that is impossible to guarantee on a windows box, so instead of checking for exactly one event they need to get new events and check the event provider instead
• The exclusion test checks if zero events were delivered by the receiver, it should check if one not filtered out was received, and this one should be generated after the event from the provider that should be excluded.

Link to tracking Issue:
Fixes #34687

Testing:
Multiple local runs, we should do a few runs on CI given the runner characteristics.

Documentation:
N/A

[pjanotti]

/label os:windows

[pjanotti]

Did not intend for all the go.mod changes, closing until that is cleaned up.