Varifier + VarWithPrimitive conflict when casted

Prior to v2.50.0, `Varifier` would encourage primitives to be assigned using `var` and most of these cases were eliminated by preferring `VarWithPrimitive`. However, when a cast is used then the two rules conflict, e.g. `??? sign = (int) Math.signum(dw * dHr);` violates either rule when given an `int` or `var`.

VarWithPrimitive

```console
> Task :simulator:compileJava FAILED
/Users/ben/projects/caffeine/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/sketch/climbing/hill/CorrelationClimber.java:84: warning: [VarWithPrimitive] Avoid using `var` with primitive types. Explicit primitive type names are short and clear, and `var` provides no benefit in readability while potentially hiding the type.
var sign = (int) Math.signum(dw * dHr);
^
(see https://errorprone.info/bugpattern/VarWithPrimitive)
Did you mean 'int sign = (int) Math.signum(dw * dHr);'?
error: warnings found and -Werror specified
1 error
1 warning

> Task :simulator:processTestResources NO-SOURCE

> Task :caffeine:compileTestJava
/Users/ben/projects/caffeine/caffeine/src/test/java/com/github/benmanes/caffeine/cache/BoundedLocalCacheTest.java:2611: warning: [VarWithPrimitive] Avoid using `var` with primitive types. Explicit primitive type names are short and clear, and `var` provides no benefit in readability while potentially hiding the type.
var cappedSampleSize = (int) (baseSampleSize * SMALL_CACHE_SAMPLE_RATIO_CAP);
^
(see https://errorprone.info/bugpattern/VarWithPrimitive)
Did you mean 'int cappedSampleSize = (int) (baseSampleSize * SMALL_CACHE_SAMPLE_RATIO_CAP);'?
error: warnings found and -Werror specified
1 error
1 warning
```

Varifier

```console
> Task :simulator:compileJava
/Users/ben/projects/caffeine/simulator/src/main/java/com/github/benmanes/caffeine/cache/simulator/policy/sketch/climbing/hill/CorrelationClimber.java:84: warning: [Varifier] Consider using `var` here to avoid boilerplate.
int sign = (int) Math.signum(dw * dHr);
^
(see https://errorprone.info/bugpattern/Varifier)
Did you mean 'var sign = (int) Math.signum(dw * dHr);'?
error: warnings found and -Werror specified
1 error
1 warning

> Task :simulator:compileJava FAILED
> Task :simulator:processTestResources NO-SOURCE

> Task :caffeine:compileTestJava
/Users/ben/projects/caffeine/caffeine/src/test/java/com/github/benmanes/caffeine/cache/BoundedLocalCacheTest.java:2611: warning: [Varifier] Consider using `var` here to avoid boilerplate.
int cappedSampleSize = (int) (baseSampleSize * SMALL_CACHE_SAMPLE_RATIO_CAP);
^
(see https://errorprone.info/bugpattern/Varifier)
Did you mean 'var cappedSampleSize = (int) (baseSampleSize * SMALL_CACHE_SAMPLE_RATIO_CAP);'?
error: warnings found and -Werror specified
1 error
1 warning
```

Reproduce the conflict using the examples in simulator/.../CorrelationClimber.java and caffeine/.../BoundedLocalCacheTest.java, then inspect the Varifier and VarWithPrimitive implementations and their tests. Determine how cast-to-primitive assignments should be diagnosed, and add regression coverage showing that the checks no longer issue mutually exclusive recommendations.

Written by the indexing model from the issue text.