Remove retriesStatus from CustomRunStatus

As discussed in [TEP-0114][tep-0114], `retries` and `retriesStatus`
will not be included in the initial release of `CustomRuns`.

In tektoncd#5662, we removed the
`retries` field from the spec. This is a follow up change removing
`retriesStatus` field from the status.

[tep-0114]: https://github.com/tektoncd/community/blob/main/teps/0114-custom-tasks-beta.md#exclude-retries-and-retriesstatus

Author: jerop

docs/pipeline-api.md

@@ -13893,20 +13893,6 @@ tasks in a pipeline.</p>
 </tr>
 <tr>
 <td>
-<code>retriesStatus</code><br/>
-<em>
-<a href="#tekton.dev/v1beta1.CustomRunStatus">
-[]CustomRunStatus
-</a>
-</em>
-</td>
-<td>
-<em>(Optional)</em>
-<p>RetriesStatus contains the history of CustomRunStatus, in case of a retry.</p>
-</td>
-</tr>
-<tr>
-<td>
 <code>extraFields</code><br/>
 <em>
 k8s.io/apimachinery/pkg/runtime.RawExtension

pkg/apis/run/v1beta1/customrunstatus_types.go

@@ -57,10 +57,6 @@ type CustomRunStatusFields struct {
 	// +optional
 	Results []CustomRunResult `json:"results,omitempty"`
 
-	// RetriesStatus contains the history of CustomRunStatus, in case of a retry.
-	// +optional
-	RetriesStatus []CustomRunStatus `json:"retriesStatus,omitempty"`
-
 	// ExtraFields holds arbitrary fields provided by the custom task
 	// controller.
 	ExtraFields runtime.RawExtension `json:"extraFields,omitempty"`