capgen: check handling of type attribute for ddts

[climbfuji]

Description

https://github.com/NCAR/ccpp-framework/blob/e86d0a7681ed96c206a44ba26bf9fd4cd302058f/scripts/metavar.py#L303

We should check why the ddt_type attribute is copied into the kind attribute and then deleted. Maybe that is not necessary? Because of this behavior, PR https://github.com/NCAR/ccpp-framework/pull/512 is introducing a workaround in add_var_debug_check (around line 1257 in scripts/suite_objects.py in the PR). Also, there is a workaround in ccpp_prebuild.py for this: https://github.com/NCAR/ccpp-framework/blob/0eca5c2c8885f3acadfed1f4945d19d1e97bb25f/scripts/metadata_parser.py#L212

Solution

Check whether this behavior is needed or not. If yes, provide more information in form of inline comments, maybe referring to this issue, so that we don't ask ourselves the same questions in a years time. If not, change the code and remove the workarounds as applicable.

Alternatives (optional)

n/a

Related to (optional)

n/a