fix: remove unused portions of effort estimate experiment (#560)

We are sticking with the sequence version, and abandoning the section
version. This commit also marks the strings for translation, as it
is a real feature now, not just an experiment.

AA-659

src/courseware/data/__factories__/courseMetadata.factory.js

@@ -9,7 +9,6 @@ Factory.define('courseMetadata')
     can_show_upgrade_sock: false,
     content_type_gating_enabled: false,
     course_expired_message: null,
-    effort: null,
     end: null,
     enrollment_start: null,
     enrollment_end: null,

src/courseware/data/api.js

@@ -16,8 +16,6 @@ export function normalizeBlocks(courseId, blocks) {
     switch (block.type) {
       case 'course':
         models.courses[block.id] = {
-          effortActivities: block.effort_activities,
-          effortTime: block.effort_time,
           id: courseId,
           title: block.display_name,
           sectionIds: block.children || [],
@@ -26,8 +24,6 @@ export function normalizeBlocks(courseId, blocks) {
         break;
       case 'chapter':
         models.sections[block.id] = {
-          effortActivities: block.effort_activities,
-          effortTime: block.effort_time,
           id: block.id,
           title: block.display_name,
           sequenceIds: block.children || [],