Add self reference for macro

[lassebenni]

Explicitly reference the helper macro 'spark__recover_partitions'

Otherwise running stage_external_sources in a Model will error with 'spark__recover_partitions' is undefined.

Description & motivation

When trying to run stage_external_sources in a Model e.g.

my_model.sql

{{
    config(
         pre_hook=[
            "{{ dbt_external_tables.stage_external_sources( select='default.my_external_table' ) }}",
        ]
    )
}}

dbt errors with

17:58:31    'spark__recover_partitions' is undefined
17:58:31    
17:58:31    > in macro get_external_build_plan (macros/common/get_external_build_plan.sql)
17:58:31    > called by macro stage_external_sources (macros/common/stage_external_sources.sql)
17:58:31    > called by macro spark__get_external_build_plan (macros/plugins/spark/get_external_build_plan.sql)

This is due to the helper macrospark__recover_partitions not being self-referenced: dbt_external_tables.spark__recover_partitions. This commit fixes this.

Checklist

• [x] I have verified that these changes work locally
• [x] I have updated the README.md (if applicable)

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