GTC-2570 Filter out rows not requiring analysis

[manukala6]

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• [x] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
• [x] Make sure you are making a pull request against the develop branch (left side). Also you should start your branch off our develop.
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Pull request type

Please check the type of change your PR introduces: - [x] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) - [ ] Refactoring (no functional changes, no api changes) - [ ] Build related changes - [ ] Documentation content changes - [ ] Other (please describe): ## What is the current behavior?

Performs analysis for difference geometries and areas with null GADM values

Issue Number: GTC-2570

What is the new behavior?

• Ignores rows where location_id = -2
• Ignores rows where gadm_id = "null"

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

[codecov-commenter]

Codecov Report

Patch has no changes to coverable lines.

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Files Changed	Coverage
...org/globalforestwatch/summarystats/afi/AFiDF.scala	0.00%

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