Change default logging level of console apps

[IgnatBeresnev]

This is a prerequisite / enabler for #2873

• Changed the default logging level of the CLI runner configuration (DEBUG -> PROGRESS)
• Changed the default logging level of DokkaConsoleLogger (DEBUG -> PROGRESS)
• Preserved the DEBUG level in public test API declarations
• Changed our tests that created DokkaConsoleLogger to create it with the DEBUG level as before, in case it was important

I don't think DEBUG is a reasonable default value for any logger. It can leak sensitive and excessive information. Luckily, this is easily configurable, so it should not cause migration problems if it affects any users/plugins.

Dokka itself emits only one log message with the debug level:

dokka/plugins/base/src/main/kotlin/translators/psi/parsers/PsiCommentsUtils.kt

Lines 106 to 109 in 73f78dc

	logger.debug(
	"Conflicting documentation for ${DRI.from(element)}" +
	"${superMethods.map { DRI.from(it) }}"
	)