Fixes performance regression

[rtibbles]

Summary

• Uses capabilities to properly check if metered connection setting should be displayed.
• Removes invocation of async function inside a computed prop that was causing continuous fetches

References

Cleanup from #11178

Reviewer guidance

Does the Device Settings page no longer make 2500 requests in 30 seconds?

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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

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• PR has 'needs review' or 'work-in-progress' label
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• 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-0.16.0b6.dev0_git.19.g43821e6e.pex
Windows Installer (EXE)	kolibri-0.16.0b6.dev0+git.19.g43821e6e-unsigned.exe
Debian Package	kolibri_0.16.0b6.dev0+git.19.g43821e6e-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.0b6.dev0+git.19.g43821e6e-0.3.0.dmg
Android Package (APK)	kolibri-0.16.0b6.dev0+git.19.g43821e6e-0.1.0-debug.apk
TAR file	kolibri-0.16.0b6.dev0+git.19.g43821e6e.tar.gz
WHL file	kolibri-0.16.0b6.dev0+git.19.g43821e6e-py2.py3-none-any.whl

[marcellamaki]

manual QA confirms the over-requesting of the endpoints have benn resolved