ci: skip anthropic instrumentation on JRuby CI (#2190)

fix: skip anthropic instrumentation on JRuby CI

The anthropic gem v1.31.0 has a JRuby load-order bug where
Anthropic::Beta is not yet defined when referenced by
BetaManagedAgentsFileResourceParams, causing NameError.

This adds anthropic to the existing JRuby skip list, following the
same pattern used for other JRuby-incompatible instrumentations.

Closes #2187

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: arielvalentin

.github/workflows/ci-instrumentation-full.yml

@@ -158,6 +158,7 @@ jobs:
           [[ "${{ matrix.gem }}" == "rails"                    ]] && echo "skip=true" >> $GITHUB_OUTPUT
           [[ "${{ matrix.gem }}" == "grpc"                     ]] && echo "skip=true" >> $GITHUB_OUTPUT
           [[ "${{ matrix.gem }}" == "gruf"                     ]] && echo "skip=true" >> $GITHUB_OUTPUT
+          [[ "${{ matrix.gem }}" == "anthropic"                 ]] && echo "skip=true" >> $GITHUB_OUTPUT
           [[ "${{ matrix.gem }}" == "net_ldap"                 ]] && echo "skip=true" >> $GITHUB_OUTPUT
           # This is essentially a bash script getting evaluated, so we need to return true or the whole job fails.
           true