[clang-tidy] Update UnusedReturnValueCheck types

[royjacobson]

Summary

Update the types for UnusedReturnValueCheck after D151383.

1. Add std::errc, std:error_condition
2. Remove absl::Status - it's marked as [[nodiscard]] anyway so it's redundant (and might create double warnings) to check it.

[PiotrZSL]

LGTM but update documentation for this check abseil::Status is listed there.

[royjacobson]

Update docs

[PiotrZSL]

clang-tools-extra/docs/clang-tidy/checks/bugprone/unused-return-value.rst

53 ↗

(On Diff #526469)

should be break into 2 lines, 80 characters limit per line.

clang-tools-extra/clang-tidy/bugprone/UnusedReturnValueCheck.cpp

: ClangTidyCheck(Name, Context),
                                    "::setjmp;"
                                    "::shm_open;"
                                    "::shmget;"
                                    "::sigismember;"
                                    "::strcasecmp;"
                                    "::strsignal;"
                                    "::ttyname")),
       CheckedReturnTypes(utils::options::parseStringList(
-          Options.get("CheckedReturnTypes", "::std::error_code;"
-                                            "::std::expected;"
-                                            "::boost::system::error_code;"
-                                            "::abseil::Status"))) {}
+          Options.get("CheckedReturnTypes",
+                      "::std::error_code;",
+                      "::std::error_condition;",
+                      "::std::errc;",
+                      "::std::expected;",
+                      "::boost::system::error_code"))) {}
 
 void UnusedReturnValueCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "CheckedFunctions", CheckedFunctions);
   Options.store(Opts, "CheckedReturnTypes",
                 utils::options::serializeStringList(CheckedReturnTypes));
 }
 
 void UnusedReturnValueCheck::registerMatchers(MatchFinder *Finder) {