fix(coverage): exclude *.test-d.* by default

[MindfulPol]

Description

Solves issue #5630 5630
Exclude {test,spec}-d files from coverage by default

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[AriPerkkio]

As test case let's add should-be-excluded-from-report.test-d.ts to test/coverage-test/src/. Simply adding that file should be enough as coverage tests are already validating all files inside that directory. If the new exclusion pattern is removed, some snapshot tests should fail.

[MindfulPol]

Hey @AriPerkkio ,
File added, thank you for pointing out. 🙏🏿
I've modified my last commit message name so it's called ''fix'' rather than ''feat'' 😄