docs: remove unsupported feature flag scope-when-expressions-to-task

This feature flag has been completely removed in v0.35.

Ref: tektoncd/pipeline#4715

docs/TektonConfig.md

@@ -73,7 +73,6 @@ The TektonConfig CR provides the following features
  require-git-ssh-secret-known-hosts: false
  results-from: termination-message
  running-in-environment-with-injected-sidecars: true
- scope-when-expressions-to-task: false
  send-cloudevents-for-runs: false
  set-security-context: false
  trusted-resources-verification-no-match-policy: ignore

docs/TektonPipeline.md

@@ -47,7 +47,6 @@ spec:
  require-git-ssh-secret-known-hosts: false
  results-from: termination-message
  running-in-environment-with-injected-sidecars: true
- scope-when-expressions-to-task: false
  send-cloudevents-for-runs: false
  set-security-context: false
  trusted-resources-verification-no-match-policy: ignore
@@ -172,10 +171,6 @@ and thus should still be considered an alpha feature.
 
  Setting this flag to "true" will enable using CEL in when expressions.
 
-- `scope-when-expressions-to-task` (Default: `false`)
-
- Setting this flag to "true" scopes when expressions to guard a Task only instead of a Task and its dependent Tasks.
-
 - `trusted-resources-verification-no-match-policy` (Default: `ignore`)
 
  Trusted Resources is a feature which can be used to sign Tekton Resources and verify them. Details of design can be found at [TEP–0091](https:/tektoncd/community/blob/main/teps/0091-trusted-resources.md). This feature is under alpha version and support v1beta1 version of Task and Pipeline. To know more about this visit [pipelines documentation](https://tekton.dev/docs/pipelines/trusted-resources/)

pkg/apis/operator/v1alpha1/tektonpipeline_types.go

@@ -106,7 +106,7 @@ type PipelineProperties struct {
  VerificationNoMatchPolicy string `json:"trusted-resources-verification-no-match-policy,omitempty"`
  EnableProvenanceInStatus *bool `json:"enable-provenance-in-status,omitempty"`
 
- // ScopeWhenExpressionsToTask Deprecated: remove in next release
+ // ScopeWhenExpressionsToTask is deprecated and never used.
  ScopeWhenExpressionsToTask *bool `json:"scope-when-expressions-to-task,omitempty"`
 
  EnforceNonfalsifiability string `json:"enforce-nonfalsifiability,omitempty"`