SSO authentication no longer uses Firefox containers

[synfinatic]

Should hopefully prevent users from having to re-authenticate their SSO session needlessly.

Fixes: #486

[codecov]

Codecov Report

Merging #491 (630bce7) into main (1556ded) will increase coverage by 0.04%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
+ Coverage   77.66%   77.70%   +0.04%     
==========================================
  Files          23       23              
  Lines        2717     2722       +5     
==========================================
+ Hits         2110     2115       +5     
  Misses        538      538              
  Partials       69       69              

Files Changed	Coverage Δ
internal/url/url.go	90.57% <100.00%> (+0.31%)	⬆️
sso/awssso_auth.go	81.82% <100.00%> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1556ded...630bce7. Read the comment docs.