fix!: verbose reporter prints tests in a list, introduce tree reporter

[sheremet-va]

Description

Make the verbose output consistent. This PR:

• Makes verbose output print only test case right after they are finished
• Moves the tree view into a --reporter=tree
• Prints tests as a tree when there is only one test file running (previously it was printing them as a list)
• Removes inline error messages in default and tree view, they are kept only in verbose reporter

TODO:

• Tests
• Document tree reporter

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[AriPerkkio]

Isn't this same as reverting #7503? I kind of liked the tree view 🤷

We could remove stuff like printTestSuite completely. Or revert all changes from base reporter to make it simpler.