[Review] test(boxsdkgen): Remove integration mappings tests (box/box-codegen#912)

[govambam]

Recreated from box#1302 for Macroscope review.

Original PR: box#1302
Status: closed (merged)

Recreated using squash merge commit - exact merged state preserved.

Original PR: box#1302

[macroscopeapp]

Remove Slack and Teams integration mappings tests from tests/sdk-gen/integrationMappings.test.ts to complete the review cleanup

Delete the integrationMappings.test.ts suite that contains Slack and Teams mapping tests and update codegen hashes in .codegen.json.

📍Where to Start

Start with the deletion diff of tests/sdk-gen/integrationMappings.test.ts, then verify hash updates in .codegen.json.

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Macroscope summarized 113d0a9.