Use resolve() instead of normpath for librrd path comparison

Ubuntu 26.04's ldd resolves symlinks and returns the real path under
/opt/omd/versions/... rather than the site symlink path under
/omd/sites/int_test/. normpath only flattens .. components; resolve()
also follows symlinks, making both sides of the assertion canonical
before comparing.

CMK-31095

Change-Id: Icedfdb9bab05c163a7fcc5063b2bc8aa582aafdd
(cherry picked from commit 862061e)

Author: nigelgbanks

tests/integration/omd/test_linked_libraries.py

@@ -206,6 +206,6 @@ def test_perl_rrds_links_against_omd_rrd_so(site: Site) -> None:
     )
     rrd_path = linked_rrd_libs[0].path
     assert rrd_path is not None, "librrd should be found by ldd"
-    assert Path(os.path.normpath(rrd_path)) == Path(site.root) / "lib/librrd.so.8", (
+    assert Path(rrd_path).resolve() == (Path(site.root) / "lib/librrd.so.8").resolve(), (
         "RRDs.so should link against a librrd which is shipped with omd."
     )