Recent climo updates have a bug if more than one history file per component

[ceblanton]

The recent climatology updates (!184) had a bug when there are multiple history file for a component. e.g.

    - type: 'atmos_scalar'
      sources:
        - history_file: "atmos_global_cmip"
        - history_file: "atmos_scalar"
      climatology:
        - frequency: yr
          interval_years: *CLIMO_YEARS
        - frequency: mon
          interval_years: *CLIMO_YEARS
      postprocess_on: True

In an input configuration like that, lines 77-100 in get_climatology_info.py (https://github.com/NOAA-GFDL/fre-workflows/blob/main/Jinja2Filters/get_climatology_info.py#L77-L100) has two bugs.

First, the closing graph string graph += f"\"\"\"\n" should be outside the for loop, not within.

Second, the opening task for a second (or more) history file for the same component should not start with &.