test(prog): drop ignore-errors on prog-module require, add featurep check

Two small tightening passes on the formatter wiring tests just shipped.

Drops `(ignore-errors ...)` from each test file's
`(require 'prog-PKG)' call. Soft use-package warnings (e.g. lsp-pyright
not being installed) still emit messages without aborting the load. A
hard load failure (syntax error, missing required dep) would now
surface as a test error rather than being silently swallowed.

Adds a `(should (featurep PKG))' assertion per language so the test
output makes "package loaded" visible alongside the fboundp and
binding checks. For webdev the assertion is `(featurep 'prog-webdev)'
since the formatter command is defined directly in prog-webdev.el
(it shells out to the prettier CLI, no separate package to load).

17 tests total now (up from 13), all passing.

0 files changed, 0 insertions, 0 deletions