Fix IP address connections

[madeline-shao-db]

When running in FIPS mode, click fails to connect to kind clusters with PKCS12 parsing errors. This occurs because click uses native-tls (OpenSSL) for IP-based connections, which internally converts PEM certificates to PKCS12 format and uses cryptographic algorithms that are disabled in FIPS mode.

[WARN] Couldn't find/load context kind-11e7gikg, now no current context. Error: Reqwest error: builder error: error:0607B0C8:digital envelope routines:EVP_CipherInit_ex:disabled for FIPS:../crypto/evp/evp_enc.c:227:, error:06074078:digital envelope routines:EVP_PBE_CipherInit:keygen failure:../crypto/evp/evp_pbe.c:130:, error:23077073:PKCS12 routines:PKCS12_pbe_crypt:pkcs12 algor cipherinit error:../crypto/pkcs12/p12_decr.c:40:, error:2306A075:PKCS12 routines:PKCS12_item_decrypt_d2i:pkcs12 pbe crypt error:../crypto/pkcs12/p12_decr.c:93:, error:23076072:PKCS12 routines:PKCS12_parse:parse error:../crypto/pkcs12/p12_kiss.c:83:

Instead use rustls for all connections since it doesn't use OpenSSL. This PR also removes all PKCS12-related code paths and dependencies.

Testing

cargo test
and cargo run on FIPS-enabled Linux system connecting to clusters via IP address.