ssl-opt.sh, compat.sh: Error out if not executing any tests

[gilles-peskine-arm]

Alert if all tests are filtered out or skipped: that probably indicates a test script that set up an unintended configuration or an overly strict filter. You can pass --min 0 to bypass this check. You can pass --min with a larger value to require that many test cases to run.

Fix a compat.sh invocation from test-ref-configs that uses a bad filter, reusing Ronald's commit from https://github.com/Mbed-TLS/mbedtls/pull/9057.

Resolves https://github.com/Mbed-TLS/mbedtls/issues/9063

PR checklist

• [x] changelog no (test only)
• [ ] 3.6 backport TODO
• [ ] 2.28 backport TODO
• [x] tests provided

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