fix(forge): mutation dynamic linking compile set

[mablr]

Summary

Fix mutation testing with dynamic test linking when the selected test set depends on helper artifacts outside the initially selected sources.

Closes #15101

Details

• Expands the mutation execution compile set to include graph sources and link-reference artifacts.
• Normalizes project-relative library paths in the linker so absolute/canonical paths still match link references.
• Adds debug logging for mutant compile/test errors that are classified as invalid.
• Adds a regression test covering selected mutation tests that depend on dynamically linked helper artifacts.

[grandizzy]

left some comments, please check, thanks!