Updates for `obsproc/v1.2` in operations

[KateFriedman-NOAA]

Description

Updates for the upstream dependency upgrade to obsproc/v1.2. Version numbers are increased and release notes are created.

Implemented into operations May 22nd during the 12z cycle.

Refs #2291

Type of change

Operational upstream upgrade

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? YES - will submit separate PR into develop to update GFS ops version in RTD

How has this been tested?

NCO para