linter: improved undefinedVariable and maybeUndefined checkers
#1121
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In the following cases: $undefinedVar ?? 100 isset($undefinedVar) no need to throw an warning about an undefined variable, since these constructs are used to check that the variable is defined.
i582
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pmakhnev/warning_on_undefined_var_in_coalesce_or_isset
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In the following cases:
no need to throw a warning about an undefined variable,
since these constructs are used to check that the
variable is defined.
Fixes #1007