Create tests to verify the new verbose API is working as expected when specific categories along with verbosity levels are set. Those tests should also check for invalid scenarios (i.e invalid verbosity level)

Definition of done:

• The test checks the output is valid when a specific category is set to a specific verbosity level (WT_VERBOSE_INFO, WT_VERBOSE_DEBUG)
• WiredTiger exits if an invalid verbosity level is set (negative value or a value greater than WT_VERBOSE_DEBUG)