Fix GH-13620: Failing openssl_private_decrypt tests

Use OPENSSL_PKCS1_OAEP_PADDING padding in tests

Closes GH-13667

[skip ci] Mark problematic openssl tests as xfail for now

Fix GH-11054: Reset OpenSSL errors when using a PEM public key

The error happens when the PEM contains a public key, as it will be
first tried to be parsed as a certificate. The parsing

Fix GH-11054: Reset OpenSSL errors when using a PEM public key

The error happens when the PEM contains a public key, as it will be
first tried to be parsed as a certificate. The parsing as a certificate
fails, which then leads to a corresponding error tracked by PHP with
the next call to php_openssl_store_errors().

This change introduces an error marking to be able to reset the stored
errors to the state before trying the certificate.

Closes GH-11055

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Make OpenSSL tests less dependent on system config

It fixes dependencies on system config if running tests with OpenSSL 3.0

Fork openssl_error_string() test for OpenSSL

The used error code differ signficantly, so use a separate test
file.

openssl_encrypt() no longer throws an error for invalid key le

Fork openssl_error_string() test for OpenSSL

The used error code differ signficantly, so use a separate test
file.

openssl_encrypt() no longer throws an error for invalid key length,
which looks like an upstream bug.

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