Improved route handlers architecture in Coach - planRoutes

[ShivangRawat30]

Summary

This is the continuation of the refactoring process for the coach page, transitioning from a global route handler to local route handlers for planRoutes. #11219

References

List of all planRoutes:

Route name	Handler/component to refactor	Refactor done?	How to test the page
PageNames.PLAN_PAGE	Doesn't need refactoring	-	Coach -> Plan
GroupsPage.name	showGroupsPage	yes	Coach -> Plan -> groups
GroupMembersPage.name	showGroupsPage	yes	Coach -> Plan -> Groups -> Select any group
GroupEnrollPage.name	showGroupsPage	yes	Coach -> Plan -> Groups -> Select any group -> Click Enroll Learners

Reviewer guidance

Please Follow the table for reviewing the refactored routes.

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.0b13.dev0_git.560.gbe6d1b32.pex
Windows Installer (EXE)	kolibri-0.16.0b13.dev0+git.560.gbe6d1b32-unsigned.exe
Debian Package	kolibri_0.16.0b13.dev0+git.560.gbe6d1b32-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b13.dev0+git.560.gbe6d1b32-0.4.0.dmg
Android Package (APK)	kolibri-0.16.0b13.dev0+git.560.gbe6d1b32-0.1.0-debug.apk
TAR file	kolibri-0.16.0b13.dev0+git.560.gbe6d1b32.tar.gz
WHL file	kolibri-0.16.0b13.dev0+git.560.gbe6d1b32-py2.py3-none-any.whl

[MisRob]

Thanks @ShivangRawat30 for your continued work. Code changes make sense and I previewed on my local Kolibri. No issues observed.

Completely up to you, just wanted to mention that opening PRs for around max 5 routes works really well on my side. I'm able to review and test much faster.

[MisRob]

And thank you for taking such a good care of testing instructions, that's very helpful too.