chore(fastly): don't publish to JSR (#796)

This PR removes the `jsr.json` file which should [prevent us from
attempting to publish to
JSR](https://github.com/launchdarkly/js-core/blob/259ce323a10aa1d129e018197ae32d1bbf005a37/scripts/publish-jsr.sh#L2-L3).
I am removing this because the [JSR is not accepting the
`fastly:kv-store`
declaration](https://github.com/launchdarkly/js-core/actions/runs/13772275771/job/38513454164).
Publishing to `npm` should be sufficient anyway.

Author: ldhenry

packages/sdk/fastly/jsr.json

@@ -22,11 +22,6 @@
     },
     "packages/sdk/fastly": {
       "extra-files": [
-        {
-          "type": "json",
-          "path": "jsr.json",
-          "jsonpath": "$.version"
-        },
         {
           "type": "json",
           "path": "example/package.json",