Honor WC_SIG_MIN_HASH_TYPE override in signature decision test

[kojo1]

Description

test_wc_SignatureDecisionCoverage asserts that SHA-1 input is rejected
by wc_SignatureVerify/Generate, assuming the default
SHA-256 hash strength floor. A build may lower the floor - configuring
with --enable-wolfclu.

Fixes zd#22151

Testing

fixed test_wc_SignatureGetSize_ecc

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[github-actions]

MemBrowse Memory Report

linuxkm-pie

• Data: __patchable_function_entries +88 B (+0.3%, 26,344 B)

linuxkm-standard

• Data: __patchable_function_entries +32 B (+0.1%, 49,032 B)
  No memory changes detected for:
• gcc-arm-cortex-m0plus
• gcc-arm-cortex-m3
• gcc-arm-cortex-m4
• gcc-arm-cortex-m4-baremetal
• gcc-arm-cortex-m4-crypto-only
• gcc-arm-cortex-m4-dtls13
• gcc-arm-cortex-m4-min-ecc
• gcc-arm-cortex-m4-openssl-compat
• gcc-arm-cortex-m4-pkcs7
• gcc-arm-cortex-m4-pq
• gcc-arm-cortex-m4-rsa-only
• gcc-arm-cortex-m4-sp-math
• gcc-arm-cortex-m4-tls12
• gcc-arm-cortex-m4-tls13
• gcc-arm-cortex-m7
• gcc-arm-cortex-m7-pq
• gcc-arm-cortex-m7-tls13
• stm32-sim-stm32h753

[dgarske]

Also double check the PR description which indicates "test_wc_SignatureGetSize_ecc", but no code changes in it.