[CI] Change codeowners for backward ABI-compatibility exclude lists (#19820)

#19719 and
#19761 added pre-commit jobs to run
E2E tests pre-built with latest "open-source" releases against the newly
built sycl-toolchain libraries. Those can fail if either an actual break
is happenning or if the test was doing some `FileCheck`ing and that
output has changed in some way (which might not be an actual ABI break).

However, I think the testing is still good enough to require an explicit
approvals by folks in charge of ABI breaking changes. For the case of
just output change the author should be able to convince owners that the
change isn't ABI-breaking relatively easily.

Author: aelovikov-intel

.github/CODEOWNERS

@@ -223,3 +223,6 @@ llvm/test/Instrumentation/ThreadSanitizer/ @intel/dpcpp-sanitizers-review
 sycl/test-e2e/AddressSanitizer/ @intel/dpcpp-sanitizers-review
 sycl/test-e2e/MemorySanitizer/ @intel/dpcpp-sanitizers-review
 sycl/test-e2e/ThreadSanitizer/ @intel/dpcpp-sanitizers-review
+
+# ABI compatibility
+devops/compat_ci_exclude.sycl-rel-** @gmlueck @xtian-github