Exclude test folder from @metamask/gator-permissions-controller build artifact

[jeffsmale90]

Explanation

Explicitly exclude /src/test from build by adding 'exclude' to tsconfig.build.json and tsconfig.json

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Build-config-only change scoped to one package; risk is limited to potentially missing a non-test file that was incorrectly placed under src/test.

Overview
Updates @metamask/gator-permissions-controller tsconfig.json and tsconfig.build.json to explicitly exclude ./src/test, preventing test sources from being picked up during local compilation and build artifact generation.

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