Deprecate `boolify` bash function

[mkavulich]

Description

ush/bash_utils/boolify.sh is an old function for convenience that ensured that "boolean" variables in bash were easy to handle; bash does not natively support boolean variables, so in our case these were comparisons with the string "TRUE" or "FALSE". Since it was hard to enforce a standard format in the early days of the workflow, this function ensured that all standard boolean-type strings (TRUE/FALSE, True/False, T/F, etc.) were handled correctly

However, since uwtools is now used to read in all variables from the config file (#1204), we don't need this "boolify" function anymore since the string representation of booleans in bash will always be the pythonic True or False. Therefore we can deprecate the boolify function and change the string comparisons to those values.

Solution

Remove all calls to boolify() and change the string comparison to True or False appropriately.

Requirements**

Remove all calls to boolify() and change the string comparison to True or False appropriately.

Acceptance Criteria (Definition of Done)

Remove all calls to boolify() and change the string comparison to True or False appropriately.