[GR-73396] Move @Uninterruptible and @AlwaysInline annotations to the shared module

[graalvmbot]

Summary

• move com.oracle.svm.guest.staging.Uninterruptible to com.oracle.svm.shared.Uninterruptible
• move com.oracle.svm.core.AlwaysInline to com.oracle.svm.shared.AlwaysInline
• update all affected imports in graal and graal-enterprise
• remove shared-module workaround substitutions that were only needed because @Uninterruptible and @AlwaysInline were not available in com.oracle.svm.shared
• keep the transitional com.oracle.svm.guest.staging root package non-empty with a small marker type so SVM_GUEST_STAGING still builds on current upstream/master

Why

The shared module now contains code that also needs to use @Uninterruptible and @AlwaysInline. Keeping these annotations outside com.oracle.svm.shared was already causing issues and forcing substitution-based workarounds instead of letting shared code annotate itself directly. See https://github.com/oracle/graal/blob/f2e0eb5e50dd46d4a72378562199aae6f057af16/substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SharedModuleUninterruptibleSubstitutions.java for example. This also lets shared utility code such as SubstrateUtil carry its runtime annotations directly instead of reintroducing them indirectly via @AnnotateOriginal substitutions. Since these annotations only matter for compiled code and are ignored in the builder as before, moving them to com.oracle.svm.shared keeps the semantics unchanged while putting them in the module where they are now actually needed.