fix: clone field within a group field type returns null values

[jasonbahl]

What does this implement/fix? Explain your changes.

checks if the value is being passed down with the' __key' or the 'key' to better compensate for clone fields, specifically when groups are cloned

• failing test: https://github.com/wp-graphql/wpgraphql-acf/actions/runs/8164650916
• passing test: https://github.com/wp-graphql/wpgraphql-acf/actions/runs/8164655172

Does this close any currently open issues?

fixes #184
fixes #151

Any other comments?

I believe this addresses the issues reported in #184 and #184

Below are some before/after examples:

Issue 184

Following the reported steps to reproduce (see #184):

Before

After

Issue 151

Following the reported steps to reproduce (see #151):

Before

After

[coveralls]

Pull Request Test Coverage Report for Build 8a34ff48313691d4393305f21bf89808a50005f3-PR-185

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.9%) to 63.437%

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Files with Coverage Reduction	New Missed Lines	%
src/FieldConfig.php	1	91.8%

Totals
Change from base Build b06cf287065c039152c7340ce8fd971acbb91391:	0.9%
Covered Lines:	2082
Relevant Lines:	3282

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💛 - Coveralls