chore(deno): Ignore deno package in codecov and gitignore deno.lock

Deno tests run via Deno's native test runner, not vitest, so codecov
cannot see their coverage. Adding packages/deno/** to the codecov ignore
list prevents false coverage drops. Also gitignore deno.lock which is
generated when running deno test.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sergical

.gitignore

@@ -54,6 +54,7 @@ tmp.js
 packages/deno/build-types
 packages/deno/build-test
 packages/deno/lib.deno.d.ts
+deno.lock
 
 # gatsby
 packages/gatsby/gatsby-node.d.ts

codecov.yml

@@ -14,3 +14,6 @@ coverage:
     patch:
       default:
         enabled: no
+
+ignore:
+  - 'packages/deno/**'