What

Add a Coverity analysis filter in the `MongoDB master` project configuration that excludes files matching `*_gen.cpp` from the `DEADCODE` and `CONSTANT_EXPRESSION_RESULT` checkers. Verify the four findings in `repl_set_config_gen.cpp` (lines 954, 970) no longer appear after the next scan. Document the filter in the Coverity triage runbook.

Resolves: SERVER-119563, SERVER-119568, SERVER-119569, SERVER-119571

Why

`repl_set_config_gen.cpp` is machine-generated by the IDL compiler and is not hand-maintained. The IDL compiler emits exhaustive branches covering every enum value; Coverity's data-flow analysis sees the restricted value range and flags the remaining branches as dead code. There is no real defect. A project-level filter is the correct fix — editing the generated file is futile since it is overwritten on every IDL change, and the same class of finding will recur for every IDL schema that gets updated.