chore(tanstackstart)!: Remove deprecated @sentry/tanstackstart utility package (#22427)

Removes the `@sentry/tanstackstart` utility package. This was just an
empty package that we never used anyway.

This also drops the package from:
- the root `package.json` workspaces
- the `.craft.yml` npm publish target
- `.github/CODEOWNERS`
- the `track-framework-updates` skill's tracked packages

Fixes #21387

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nicohrubec

.agents/skills/track-framework-updates/sources.json

@@ -201,7 +201,7 @@
     },
     {
       "name": "TanStack Start",
-      "sentryPackages": ["@sentry/tanstackstart", "@sentry/tanstackstart-react"],
+      "sentryPackages": ["@sentry/tanstackstart-react"],
       "category": "meta-framework",
       "github": {
         "repo": "TanStack/router",

.craft.yml

@@ -127,9 +127,6 @@ targets:
   - name: npm
     id: '@sentry/sveltekit'
     includeNames: /^sentry-sveltekit-\d.*\.tgz$/
-  - name: npm
-    id: '@sentry/tanstackstart'
-    includeNames: /^sentry-tanstackstart-\d.*\.tgz$/
   - name: npm
     id: '@sentry/tanstackstart-react'
     includeNames: /^sentry-tanstackstart-react-\d.*\.tgz$/

.github/CODEOWNERS

@@ -46,6 +46,5 @@
 /packages/solidstart/               @getsentry/team-javascript-sdks-framework
 /packages/svelte/                   @getsentry/team-javascript-sdks-framework
 /packages/sveltekit/                @getsentry/team-javascript-sdks-framework
-/packages/tanstackstart/            @getsentry/team-javascript-sdks-framework
 /packages/tanstackstart-react/      @getsentry/team-javascript-sdks-framework
 /packages/vue/                      @getsentry/team-javascript-sdks-framework

package.json

@@ -94,7 +94,6 @@
     "packages/solidstart",
     "packages/svelte",
     "packages/sveltekit",
-    "packages/tanstackstart",
     "packages/tanstackstart-react",
     "packages/types",
     "packages/typescript",