fix(cli): do not throw during migrate if project ID is passed through…

… flag (#7594)

### Description

This PR sets the `apiClient`'s `requireProject` to `false` and instead
only throws an error if both the cli config and the `--project` option
are missing

### What to review

Verify that the change is as expected and that the wording of the error
is correct.

### Testing
* create a simple migration script with sanity, `sanity migration
create` and follow the prompt
make sure there is no `sanity.cli.js` in your codebase

Next steps:
* Open /code/migrations/migration_id/index.ts in your code editor and
write the code for your migration.
* Dry run the migration with:
`sanity migration run migration_id --project= --dataset`
* Run the migration against a dataset with:
`sanity migration run migration_id --project= --dataset --no-dry-run`

* edit the script and run it as:
`sanity migration run migration_id --project=real_project_id --dataset
real_dataset`

you should NOT get an error. 

Test again without specifying a `--project` project ID, you should see
an error.

### Notes for release
None
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---------

Co-authored-by: Espen Hovlandsdal <[email protected]>

packages/sanity/src/_internal/cli/commands/migration/runMigrationCommand.ts

@@ -164,9 +164,15 @@ const runMigrationCommand: CliCommandDefinition<CreateFlags> = {
 
     const projectConfig = apiClient({
       requireUser: true,
-      requireProject: true,
+      requireProject: false,
     }).config()
 
+    if (!project && !projectConfig.projectId) {
+      throw new Error(
+        'sanity.cli.js does not contain a project identifier ("api.projectId") and no --project option was provided.',
+      )
+    }
+
     const apiConfig = {
       dataset: dataset ?? projectConfig.dataset!,
       projectId: project ?? projectConfig.projectId!,