Improve path normalization with a fallback for non-existent paths

[shatakshiiii]

SUMMARY

• Fixes the FileNotFoundError for paths that do not exist.

• Moves the cache path generation outside of the loop (unrelated to the above error, just found and corrected it)

[shatakshiiii]

1st change -

  entry_value = entry.value.current.replace("$PWD", str(Path.cwd()))
  normalized = Path(entry_value).resolve(strict=strict_resolve).as_posix()

Even though the above change solves one problem i.e. running ansible-navigator commands. It stills crashes while I debug the code locally. So reverting this change as I need to check if there is a need of strict_resolve at line https://github.com/ansible/ansible-navigator/blob/main/src/ansible_navigator/configuration_subsystem/navigator_post_processor.py#L650