2022-June-25 - Prerelease - 2.6.977

Infra: Add CLI flags & improve 'run_ansible' scirpt (#10750)

Add dry-run, verbose, and check args to run_ansible script.
These args in turn toggle ansible flags

Improve 'run_ansible' to make paths relative to the script
file location. This allows 'run_ansible' to be invoked
from an arbitrary current folder (eg: can now execute:
./infrastructure/run_ansible). We also now need to
set an 'ANSIBLE_CFG' because the ansibe.cfg config
file is no longer guaranteed to be in the current folder.

Last, we have some general edits to make variable naming
more consistent, and we add some 'readonly' flags into
for robustness and reading clarity