[8.x](backport #40901) [metricbeat][panw] fix concurrent map write error caused by reusing a mapstr.M#40903
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Co-authored-by: dparkerelastic <david.parker@elastic.co> (cherry picked from commit 26daf71)
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In the existing code, we create a mapstr.M containing attributes to set in the
RootFieldsof metric events, which is reused several times in a loop. In the publisher code, the root fields are modified, e.g. https://github.com/elastic/beats/blob/main/metricbeat/mb/event.go#L79, which causes a panic due tofatal error: concurrent map iteration and map write, as the same mapstr.M object is still being used in later iterations of the loop.Proposed commit message
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This is an automatic backport of pull request #40901 done by [Mergify](https://mergify.com).