[Testing] Fix spiffe portability (#41205)

[Testing] Fix spiffe portability (#41205)

Fix a few issues when build with OpenSSL versions

OpenSSL1.0.2 - copied some CRL related test code that was not valid assumptions for these tests.
OpenSSL1.1.1 - The regex is too sensitive, only do the regex check for BoringSSL
OpenSSL3 - We though the Invalid UTF8-SAN behavior should cause handshake failures for OpenSSL3 here and included different behavior, but that is still what is breaking. Let's revert that change.

Closes #41205

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/41205 from gtcooke94:fix_spiffe_portability 8818df50053944444c1093bdf500944b690422d3
PiperOrigin-RevId: 842526173