[analyzer] Fix alignment of entries in -analyzer-help (#190570) Fix a formatting bug in `AnalyzerOptions::printFormattedEntry` (used by `clang -cc1 -print-analyzer-options`), which led to misalignment of a checker description. This commit ensures that `printFormattedEntry` inserts a newline in the corner case when the length of the name of a checker is exactly equal to `EntryWidth`. (In this situation the old code inserted a space between the name and the description, so this description was not aligned with the other descriptions.) Additionally this commit also fixes the corner case where the pad before the checker name (specified by `InitialPad`) is 0. Before the fix, due to `llvm::raw_formatted_ostream::PadToColumn` logic, `InitialPad = 0` still added one space character as padding before the checker name. Fortunately `InitialPad = 0` was never used in the program, so this bug was not visible to the user. These changes are both tested by the freshly added unit tests.
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