feat(diagnostic)!: filter diagnostics by severity before passing to handlers (#30070)

BREAKING CHANGE: This changes the list of diagnostics that are passed to
a diagnostic handler. If a handler is already filtering by severity
itself then this won't break anything, since the handler's filtering
will become a no-op. But handlers which depend on receiving the full
list of diagnostics may break.

Note that diagnostics are only filtered if the handler's configuration
has the `severity` option set. If `severity` is not set, the handler
still receives the full list of diagnostics.

0 files changed, 0 insertions, 0 deletions