Enable a few more Guava Primitives tests for J2KT

- some Base regex helpers have become available for J2KT since last iteration. Thanks cpovirk@ for pointing this out
- there was a transpiler improvement:

  `GREATEST - (short) 1` is a compile time constant in Java and can be used to
  initialize a `short` because the compiler can verify that the value is small
  enough. The straight-forward translation `GREATEST - 1.toShort()` is not a
  compile time constant in Kotlin and cannot be used to initialize a `Short`. The
  transpiler handles this now

RELNOTES=n/a
PiperOrigin-RevId: 611467476