dbSta: check LEF pins against Liberty

[naveenvenk17]

Summary

• add LEF/LIB-CHK-012 to warn when a LEF non-supply pin is missing from the matching Liberty cell
• keep the check conditional on a matching Liberty cell so LEF-only IP checks do not become noisy
• register a focused pass/fail regression fixture in both Bazel and CMake

Related to #4872.

Tests

• PASS: git diff --check
• PASS: bazelisk build --jobs=4 --local_cpu_resources=4 //src/dbSta:IpChecker
• BLOCKED: bazelisk test --jobs=4 --local_cpu_resources=4 //src/dbSta/test:check_ip_liberty_pins-tcl_test on the Ubuntu 22.04 GCP VM fails before test execution while linking openroad with unresolved __isoc23_* glibc symbols from the Bazel LLVM/sysroot toolchain.

[gemini-code-assist]

Code Review

This pull request introduces a new check, LEF/LIB-CHK-012, to verify that LEF signal pins exist in the corresponding Liberty cell. It implements the checkLibertyPinPresence method in IpChecker and adds a new pass/fail regression test check_ip_liberty_pins to validate this functionality. There are no review comments, so I have no feedback to provide.