test: versioned constant getters

[rootulp]

Context

During a 1:1 w/ @evan-forbes , we noticed that the versioned constant getters don't have any unit tests.

[coderabbitai]

Walkthrough

Walkthrough

The changes involve the introduction of new test functions in the appconsts_test package to ensure the correctness of constants across different versions of the appconsts package. These tests are designed to verify the values of constants related to subtree root thresholds and square size upper bounds in various package versions. Additionally, there have been modifications to the constants within the appconsts, testground, v1, and v2 packages, likely to align with new requirements or specifications.

Changes

File Path	Change Summary
pkg/appconsts/versioned_consts_test.go	Added test functions TestSubtreeRootThreshold and TestSquareSizeUpperBound.
pkg/appconsts/.../v1	Modified constants Version, SubtreeRootThreshold, and SquareSizeUpperBound.
pkg/appconsts/.../v2	Modified constants Version, SubtreeRootThreshold, and SquareSizeUpperBound.
pkg/appconsts/.../testground	Modified constants Version, SubtreeRootThreshold, and SquareSizeUpperBound.

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