[clang] Merge lifetimebound and GSL code paths for lifetime analysis (#104906) In the current lifetime analysis, we have two parallel code paths: one for lifetimebound and another for GSL. These paths perform the same logic, both determining whether to continue visiting subexpressions. This PR merges the two paths into a single code path. As a result, we'll reduce the overhead by eliminating a redundant visit to subexpressions. The change is mostly NFC (No Functional Change). The only notable difference is that when a subexpression is visited due to either lifetimebound or GSL, we will prioritize the lifetimebound path. This means the final diagnostic will be -Wdangling (rather than both `-Wdangling` and `-Wdangling-gsl`) This might cause a slight change in behavior if the -Wdangling diagnostic is disabled, but I think this is not a major concern since both diagnostics are enabled by default. Fixes #93386
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