cloudposse/atmos v1.176.0-rc.2 on GitHub

Update `overrides` section. Add tests @aknysh (#1259)

## what

Update overrides section
Add tests

why

Improve the overrides section to detect and process the inline overrides in the imported stack manifests to allow the configurations like these:

vars:
  stage: prod

import:
  # The `overrides` is imported after the component `c1` is imported.
  # The `overrides` should not override anything for the component `c1`.
  - catalog/c1
  - catalog/overrides

vars:
  stage: prod

import:
  # The `overrides` is imported before the component `c1` is imported.
  # The `overrides` will override the component `c1` configuration.
  - catalog/overrides
  - catalog/c1