Fix bugs in Permissions pages caused by "unique username" assumption

[jonboiser]

Summary

1. Fixes bug where two users (w/ same username and different ID) would be marked as "You" and displayed incorrectly on the ManagePermissionsPage (Fixes "(you)" label on device permissions page matches on username and not ID #7130 )
2. Fixes bug where buttons and checkboxes would be disabled on the UserPermissionsPage if the user being viewed has the same username (but different user ID). Fixes cannot elevate user in another facility to super admin #7159
3. Adds optimization to ManagePermissionsPage to use a memoized function to display the Facility name on the table, which will reduce computations for large lists of users.
4. Fix bug where the wrong AppBarTitle would appear on Facility > All Facilities Page

Reviewer guidance

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References

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Contributor Checklist

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Reviewer Checklist

• Automated test coverage is satisfactory
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• 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

[codecov]

Codecov Report

Merging #7182 into release-v0.14.x will decrease coverage by 0.04%.
The diff coverage is 0.00%.

Impacted Files	Coverage Δ
...ssets/src/views/ManagePermissionsPage/UserGrid.vue	0.00% <0.00%> (ø)
...ice/assets/src/views/UserPermissionsPage/index.vue	0.00% <0.00%> (ø)
...lugins/facility/assets/src/views/FacilityIndex.vue	0.00% <0.00%> (ø)
kolibri/utils/logger.py	82.50% <0.00%> (-12.50%)	⬇️
kolibri/core/content/utils/channel_import.py	88.48% <0.00%> (-0.57%)	⬇️
.../core/deviceadmin/management/commands/dbrestore.py	76.56% <0.00%> (ø)