[GR-45839] CI: Avoid using 8GB mac minis for native tests

* They seem too slow.

Author: eregon

ci.jsonnet

@@ -502,6 +502,7 @@ local composition_environment = utils.add_inclusion_tracking(part_definitions, "
       local gate = gate_no_build + $.use.build,
       local native_config = $.run.generate_native_config + $.run.check_native_config,
       local native_tests = $.run.testdownstream_aot + $.run.test_integration + $.run.test_compiler,
+      local darwin_amd64_enough_ram = { capabilities+: ["!macmini_late_2014_8gb"] }, # GR-45839
 
       # Order: platform, jdk, mx_env. Keep aligned for an easy visual comparison.
       "ruby-test-specs-linux-17":          $.platform.linux  + $.jdk.v17 + $.env.jvm + gate_no_build + $.use.build + $.run.test_unit_tck + native_config + $.run.test_specs + { timelimit: "01:20:00" },
@@ -535,8 +536,8 @@ local composition_environment = utils.add_inclusion_tracking(part_definitions, "
 
       "ruby-test-svm-graal-core-linux-17":              $.platform.linux          + $.jdk.v17 + $.env.native    + $.env.gdb_svm + gate + native_tests,
       "ruby-test-svm-graal-core-linux-20":              $.platform.linux          + $.jdk.v20 + $.env.native    + $.env.gdb_svm + gate + native_tests,
-      "ruby-test-svm-graal-core-darwin-amd64-17":       $.platform.darwin_amd64   + $.jdk.v17 + $.env.native    + $.env.gdb_svm + gate + native_tests,
-      "ruby-test-svm-graal-core-darwin-amd64-20":       $.platform.darwin_amd64   + $.jdk.v20 + $.env.native    + $.env.gdb_svm + gate + native_tests,
+      "ruby-test-svm-graal-core-darwin-amd64-17":       $.platform.darwin_amd64   + $.jdk.v17 + $.env.native    + $.env.gdb_svm + gate + native_tests + darwin_amd64_enough_ram,
+      "ruby-test-svm-graal-core-darwin-amd64-20":       $.platform.darwin_amd64   + $.jdk.v20 + $.env.native    + $.env.gdb_svm + gate + native_tests + darwin_amd64_enough_ram,
       "ruby-test-svm-graal-core-darwin-aarch64-17":     $.platform.darwin_aarch64 + $.jdk.v17 + $.env.native    +                 gate + native_tests,
       "ruby-test-svm-graal-core-darwin-aarch64-20":     $.platform.darwin_aarch64 + $.jdk.v20 + $.env.native    +                 gate + native_tests,
       "ruby-test-svm-graal-enterprise-linux":           $.platform.linux          + $.jdk.v17 + $.env.native_ee + $.env.gdb_svm + gate + native_tests,