fix, temporarily disable manual labels from cli (#3277)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Temporarily disables manual labels support (keeping tags) across the
Terraform workflow, submit-plan action, and CLI flags.
>
> - **CI/Workflows**:
> - In `.github/workflows/terraform.yml`, comment out `labels` for both
prod and dogfood `submit-plan` steps.
> - **GitHub Action (`actions/submit-plan`)**:
>   - Comment out the `labels` input definition in `action.yml`.
> - Skip passing `--labels` to the CLI by commenting out the labels arg
handling.
> - **CLI**:
> - In `cli/cmd/flags.go`, comment out registration of the `labels` flag
in `addChangeCreationFlags`.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
333a8aca2f1716b46f7777b352b5bd6ba4bf8506. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

GitOrigin-RevId: b512fe21a0a845e13b1bb8cf9b7859ea86408b30

Author: tphoney

cmd/flags.go

@@ -31,7 +31,8 @@ func addChangeCreationFlags(cmd *cobra.Command) {
 	cmd.PersistentFlags().String("terraform-plan-output", "", "Filename of cached terraform plan output for this change.")
 	cmd.PersistentFlags().String("code-changes-diff", "", "Filename of the code diff of this change.")
 	cmd.PersistentFlags().StringSlice("tags", []string{}, "Tags to apply to this change, these should be specified in key=value format. Multiple tags can be specified by repeating the flag or using a comma separated list.")
-	cmd.PersistentFlags().StringSlice("labels", []string{}, "Labels to apply to this change, these should be specified in name=color format where color is a hex code (e.g., FF0000 or #FF0000). Multiple labels can be specified by repeating the flag or using a comma separated list.")
+	// ENG-1985, disabled until we decide how manual labels and manual tags should be handled.
+	// cmd.PersistentFlags().StringSlice("labels", []string{}, "Labels to apply to this change, these should be specified in name=color format where color is a hex code (e.g., FF0000 or #FF0000). Multiple labels can be specified by repeating the flag or using a comma separated list.")
 }
 
 func parseTagsArgument() (*sdp.EnrichedTags, error) {