Add external feature injection to GCC toolchain (like toolchains_llvm extra_known_features)

[RSingh1511]

Feature Request / Modification Description

score_cpp_policies defines sanitizer configurations as cc_feature targets (asan_ubsan_lsan_link, tsan_link). These can currently only be injected into the LLVM toolchain via extra_known_features (toolchains_llvm PR #678).

We need the same mechanism for the S-CORE GCC toolchain so both toolchains consume sanitizer features from a single source.

Proposed change:

Add extra_known_features (or equivalent) to score_bazel_cpp_toolchains
Replace the existing built-in asan/lsan/tsan/ubsan features by pulling them from score_cpp_policies

References:
eclipse-score/score_cpp_policies#1
eclipse-score/communication#182
bazel-contrib/toolchains_llvm#678

Expected Changes ot work products

• Requirements
• Architecture
• Safety Analysis
• Security Analysis
• Detailed Design
• Implementation and Testing
• all

Impact analysis

Build tooling change only. No impact on production code, safety analysis,
or security. Consuming modules (communication, logging) will use a single
sanitizer configuration instead of toolchain-specific ones.

Safety or Security relevance

• none
• Safety relevant
• Security relevant

Expected required ASIL classification

QM

Expected Implementation Version (Release)

1.0