[clang][ssaf] Refactor path validation into shared `FormatFile` utilities (#188847)
This patch introduces the following changes:
- Renames `SummaryFile` to `FormatFile` to better reflect that the
struct pairs a file path with its resolved `SerializationFormat`.
- Consolidates duplicated input/output path validation logic from
`SSAFLinker.cpp` and `SSAFFormat.cpp` into shared
`FormatFile::fromInputPath()` and `FormatFile::fromOutputPath()` methods
in `Tool/Utils.{h,cpp}`
- Moves error message constants from the public header into the `.cpp`
file and rewords them.
- Removes per-tool local error messages and filesystem logic that are
now handled centrally.
- Updates all affected lit tests to match the new error message wording
and adds a test for directory-as-input.
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