Fixes for Ed25519 raw key import with C# wrapper

[JacobBarthelmeh]

ZD20644

[devin-ai-integration]

🛟 Devin Lifeguard found 1 likely issues in this PR

• check-all-return-codes snippet snippet: After each call (e.g., ret = wolfcrypt.Ed25519ImportPublic(...) or wc_ed25519_delete(...)) add if (ret != 0) { /* handle or throw */ } to ensure the return code is checked and errors are handled.

@JacobBarthelmeh
please take a look at the above issues which Devin flagged. Devin will not fix these issues automatically.

[JacobBarthelmeh]

Retest this please Jenkins.

Aarch64 test ERROR: Error fetching remote repo 'origin'

[aidangarske]

Looks good to me thanks