Revert the commits below as the current main doesn't work with unknow…

[junaruga]

…n error on Terra.

Revert "bio-diversity-genomics-garg.wdl: Remove comment."

This reverts commit 1ecc858ad76b35a57724f2f3cb12f86f3f8fbf1b.

Revert "Add check_input task to check the input parameters early. (#16)"

This reverts commit 34ec7d7a36a216c82fe2f052eb1d939845c86e7c.