Refactor Password Variables to Use `const char[]` Arrays

- Converted password declaration from `char*` to `const char[]`.
- Updated `memcpy` and `return` statements accordingly to use `s

Refactor Password Variables to Use `const char[]` Arrays

- Converted password declaration from `char*` to `const char[]`.
- Updated `memcpy` and `return` statements accordingly to use `sizeof` instead of predefined lengths.
- Renamed `key_password` into `weak_password` to match test name.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25330)

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Refactor Callback Tests for Improved Memory Management

Refactor the callback test code to replace global variables with local structures, enhancing memory management and reducing reliance on

Refactor Callback Tests for Improved Memory Management

Refactor the callback test code to replace global variables with local structures, enhancing memory management and reducing reliance on redundant cleanup logic.

Using a local struct containing a magic number and result flag to ensure the correct handling of user data and to verify that the callback function is invoked at least once during the test.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25330)

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Add test for BIO password callback functionality

Related to #8441

This commit introduces a test suite for the password callback mechanism used when reading or writing encrypted and

Add test for BIO password callback functionality

Related to #8441

This commit introduces a test suite for the password callback mechanism used when reading or writing encrypted and PEM or DER encoded keys via a BIO in OpenSSL. The test is designed to cover various edge cases, particularly focusing on scenarios where the password callback might return unexpected or malformed data from user code.

By simulating different callback behaviors, including negative returns, zero-length passwords, passwords that exactly fill the buffer and wrongly reported lengths. Also testing for the correct behaviour of binary passwords that contain a null byte in the middle.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25330)

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