enhancement(kubernetes_logs): support scraping metadata from Kubernetes log files on Windows

[damoxc]

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This implements the changes from #19799, including the suggested fix for the failing test. I've been running the change with the path separator successfully for 5 months on Windows.

This resolves #18521.

[bits-bot]

All committers have signed the CLA.

[damoxc]

@jszwedko I've added a changelog entry, hopefully I got it right!

[jszwedko]

Note that there are some compilation errors here when you have some time @damoxc

[jszwedko]

Actually, it was just a missing import I think so I pushed a commit adding it.

[damoxc]

@jszwedko I've had a go at fixing the type errors in the tests, still quite new to Rust so not 100% sure if I'm doing the right thing

[damoxc]

@jszwedko forgot to run cargo fmt on the changes, I've just pushed another commit for that