Move FIPS self-test data into a separate .c file

Move FIPS self-test data into a separate .c file

The Known Answer Test (KAT) data, previously in `self_test_data.inc`, is moved
into its own compilation unit, `self_test_data.c`. This separates the large
data definitions from the test execution logic.

This refactoring improves code organization and modularity. A new header,
`self_test_data.h`, is added to declare the data arrays for external linkage.
The shared data structure definitions are moved to `self_test.h` to be
accessible by both the test logic and the data files.

Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/29222)