infra: compile: fix jvm introspector builds (#10623)

Ref:
#10481 (comment)

Java projects are currently failing Fuzz Introspector following
#10538

```bash
Step #6 - "compile-libfuzzer-introspector-x86_64": ---------------------------------------------------------------
Step #6 - "compile-libfuzzer-introspector-x86_64": chmod: cannot access '/workspace/out/libfuzzer-introspector-x86_64/jazzer_driver_with_sanitizer': No such file or directory
Step #6 - "compile-libfuzzer-introspector-x86_64": ********************************************************************************
```

There is a missing "introspector" conditional in
https://github.com/google/oss-fuzz/blob/6922c8c1ac27c9a459ce41201991e296a6bace54/infra/base-images/base-builder/compile#L152-L171

This causes line 171 to fail.

It may be convenient to search for "jvm" in the table here
https://introspector.oss-fuzz.com/indexing-overview which will show the
introspector build status is red for all.

infra/base-images/base-builder/compile

@@ -164,8 +164,8 @@ EOF
 this_dir=$(dirname "$0")
 "$this_dir/jazzer_driver" --ubsan "$@"
 EOF
-  elif [ "$SANITIZER" = "coverage" ]; then
-    # Coverage builds require no instrumentation.
+  elif [ "$SANITIZER" = "coverage" ] ||  [ "$SANITIZER" = "introspector" ]; then
+    # Coverage & introspector builds require no instrumentation.
     cp $(which jazzer_driver) $jazzer_driver_with_sanitizer
   fi
   chmod +x $jazzer_driver_with_sanitizer