Pluralizing CFFDRS

**Describe the task**
CFFDRS R library accepts arrays of inputs. We currently only supply inputs one at a time. Refactor calls to CFFDRS to input HFI inputs as arrays to potentially speed up our backend calculations.

**Acceptance Criteria**
- [ ] CFFDRS to input HFI inputs as arrays instead of singular values

**Additional context**
- Existing pull request has implemented a good chunk of the work already: https://github.com/bcgov/wps/pull/1612

Start by reviewing the existing pull request at https://github.com/bcgov/wps/pull/1612 and the current CFFDRS calls it changes. Confirm that HFI inputs are passed as arrays rather than singular values and verify that backend calculations still produce the expected results.

Written by the indexing model from the issue text.