Better error information for failed reports when processing coverage reports

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Release notes

Problem to solve

Based on #406500 (comment 1853737592)

From what I understand from what @duncan_harris is asking for is that sometimes the code coverage report that is uploaded doesn't work, and we don't have a good way of informing the user why it didn't work. I don't think we have any tooling around this to let users test their reports to validate that they will work as expected.

Proposal

Intended users

Feature Usage Metrics

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