Fix tests results upload

[raskad]

Since the 262 tests action now takes a bit longer we had multiple cases where the git push to the gh-pages branch on main did not work because the pulled gh-pages branch was outdated.

This PR attempts to solve this by moving the checkout action for the gh-pages branch after the running of the tests. In most cases this should solve the issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (34d0084) 47.43% compared to head (ce4ec96) 47.41%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3635      +/-   ##
==========================================
- Coverage   47.43%   47.41%   -0.03%     
==========================================
  Files         476      476              
  Lines       46288    46303      +15     
==========================================
- Hits        21959    21955       -4     
- Misses      24329    24348      +19     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	96,310	96,310	0
Passed	79,712	79,712	0
Ignored	4,217	4,217	0
Failed	12,381	12,381	0
Panics	0	0	0
Conformance	82.77%	82.77%	0.00%