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project: omit final newline from generated vcpkg manifests

Dependabot's vcpkg updater rewrites `vcpkg.json` and
`vcpkg-configuration.json` without a trailing newline. Wiswa was
generating them with one, so every regeneration after a Dependabot bump
diffed against the post-Dependabot state and produced a
formatting-only commit; the next Dependabot run stripped the newline
again, causing an endless PR loop.

Suppress the newline at every layer that would otherwise re-add it,
because any single layer is enough to revive the loop:

- `evaluate_jsonnet_project` now skips the trailing `\n` for filenames
  matching `_NO_FINAL_NEWLINE_PATTERNS` (currently `vcpkg*.json`),
  matched against the basename via `fnmatch.fnmatchcase` so the rule
  stays extensible and survives nested output paths.
- The generated `.prettierignore` for C/C++ projects gains
  `vcpkg*.json`. Prettier has no option to disable its final-newline
  insertion (see prettier/prettier#6360, #13036, #14357), so ignoring
  the files is the only way to stop `prettier --write` re-adding it.
- The `end-of-file-fixer` pre-commit hook now excludes
  `^vcpkg.*\.json$`.

Each tool's pattern syntax differs (gitignore-glob, regex,
fnmatch-glob), so they are spelled out per-tool rather than shared.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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