Extend SVS_URL logic with new binaries

[memark]

Extend SVS_URL logic with new binaries from Intel for older systems, in order to enable LTO compilation between C and Rust for these platforms in RediSearch.

The binaries are currently named "nightly", but those links are permanent. They will be renamed in a coming SVS release.

RediSearch workflow run pointing to this commit
https://github.com/RediSearch/RediSearch/actions/runs/24208329013

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Note

Medium Risk
Build-time logic now runs compiled probes to select SVS prebuilt binaries and may change which artifacts (or source builds) are used on different Linux toolchains, potentially breaking CI or user builds if detection/matrix assumptions are wrong.

Overview
Updates cmake/svs.cmake to replace compile-and-run GLIBC feature checks with try_run probes that capture the exact detected GLIBC version and _GLIBCXX_RELEASE (libstdc++ header/GCC major) at configure time.

Extends SVS_URL selection to support new Intel nightly SVS shared-library binaries for Clang 21 (with GLIBC >= 2.31) and chooses the artifact based on detected libstdc++ release (GCC 11/12/13); otherwise it disables SVS_SHARED_LIB with updated gating messages. GCC-path selection is also adjusted to use the detected GLIBC version string (>=2.28, fallback >=2.26) when picking existing v0.3.0 binaries.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.98%. Comparing base (f177c40) to head (88e5ff2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #928   +/-   ##
=======================================
  Coverage   96.98%   96.98%           
=======================================
  Files         129      129           
  Lines        7574     7574           
=======================================
  Hits         7346     7346           
  Misses        228      228           

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[ethanglaser]

Actually one more thought from my side before merging: we are providing a single shared library build for standard gcc11 (svs-shared-library-0.3.0-reduced.tar.gz) which is meant to work with gcc11-13 - I believe the same breadth of support would be applicable here. Could you check if the clang21-gcc11 build works for gcc12 and gcc13 as well? Unless it breaks stuff (but I believe the LTO strictness would only apply to clang version) or performs worse, it would be great to consolidate to a single library