feat(core): enable the "Override Helm chart artifact" checkbox in man…

…ual execution by default (#7818)

Since this is manual execution, it seems like a safe assumption that people want to
specify the helm chart to use.  Leaving it unchecked either leads to pipeline failure, or
to using an artifact from a prior execution (if enabled), both of which are surprising.

app/scripts/modules/core/src/pipeline/config/stages/bakeManifest/ManualExecutionBakeManifest.tsx

@@ -9,7 +9,7 @@ import { BAKE_MANIFEST_STAGE_KEY } from './bakeManifestStage';
 const HelmEditor = HelmMatch.editCmp;
 
 export function ManualExecutionBakeManifest(props: ITriggerTemplateComponentProps) {
-  const [overrideArtifact, setOverrideArtifact] = React.useState(false);
+  const [overrideArtifact, setOverrideArtifact] = React.useState(true);
 
   const updateHelmArtifact = (artifact: IArtifact) => {
     const updatedArtifacts = (props.command.extraFields.artifacts || []).filter(