Conditionalizes the loading action for quiz routes

[akolson]

Summary

This PR conditionalizes the loading action for quiz routes that seems to causes white flashes when navigating around the coach plugin enhanced quiz management.

References

Fixes #11732

Reviewer guidance

Navigate around the enhanced quiz management and ensure that there are no white flashes described in #11732
Also, ensure that no regressions have been introduced by the conditionalization.

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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.493.gf1313dac.pex
Windows Installer (EXE)	kolibri-0.16.0b13.dev0+git.493.gf1313dac-unsigned.exe
Debian Package	kolibri_0.16.0b13.dev0+git.493.gf1313dac-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b13.dev0+git.493.gf1313dac-0.3.0.dmg
Android Package (APK)	kolibri-0.16.0b13.dev0+git.493.gf1313dac-0.1.0-debug.apk
TAR file	kolibri-0.16.0b13.dev0+git.493.gf1313dac.tar.gz
WHL file	kolibri-0.16.0b13.dev0+git.493.gf1313dac-py2.py3-none-any.whl

[nucleogenesis]

This is great thanks Samson. I've tested locally and this will be a good stop-gap measure before the coach routing is reworked altogether.