update MOM6 to its main branch 20211019 commit

[jiandewang]

PR Checklist

• Ths PR is up-to-date with the top of all sub-component repositories except for those sub-components which are the subject of this PR. Please consult the ufs-weather-model wiki if you are unsure how to do this.

• This PR has been tested using a branch which is up-to-date with the top of all sub-component repositories except for those sub-components which are the subject of this PR

• An Issue describing the work contained in this PR has been created either in the subcomponent(s) or in the ufs-weather-model. The Issue should be created in the repository that is most relevant to the changes in contained in the PR. The Issue and the dependent sub-component PR
  are specified below.

• If new or updated input data is required by this PR, it is clearly stated in the text of the PR.

Instructions: All subsequent sections of text should be filled in as appropriate.

The information provided below allows the code managers to understand the changes relevant to this PR, whether those changes are in the ufs-weather-model repository or in a subcomponent repository. Ufs-weather-model code managers will use the information provided to add any applicable labels, assign reviewers and place it in the Commit Queue. Once the PR is in the Commit Queue, it is the PR owner's responsiblity to keep the PR up-to-date with the develop branch of ufs-weather-model.

Description

MOM6 main branch was updated on 20211019, needs to make corresponding update in UFS. Note this updating will require a new baseline as new variable has been added in restart file.

Issue(s) addressed

Link the issues to be closed with this PR, whether in this repository, or in another repository.
(Remember, issues must always be created before starting work on a PR branch!)

• fixes ufs issue update MOM6 to 20211019 main branch commit #876
• fixes MOM6 issue update MOM6 to GFDL 20211019 main branch commit NOAA-EMC/MOM6#77

Testing

How were these changes tested? What compilers / HPCs was it tested with? Are the changes covered by regression tests? (If not, why? Do new tests need to be added?) Have regression tests and unit tests (utests) been run? On which platforms and with which compilers? (Note that unit tests can only be run on tier-1 platforms)

• hera.intel
• hera.gnu
• orion.intel
• cheyenne.intel
• cheyenne.gnu
• gaea.intel
• jet.intel
• wcoss_cray
• wcoss_dell_p3
• CI

Dependencies

If testing this branch requires non-default branches in other repositories, list them. Those branches should have matching names (ideally).

Do PRs in upstream repositories need to be merged first?
If so add the "waiting for other repos" label and list the upstream PRs

• waiting on noaa-emc/nems/pull/<pr_number>
• waiting on noaa-emc/fv3atm/pull/<pr_number>

[junwang-noaa]

This PR as combined with PR#863 and committed to ufs-weather-model repo.