ci: adjust assethub endpoint

[preschian]

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PR Type

• Bugfix
• Feature
• Refactoring

Context

• based on e2e error on main branch https://github.com/kodadot/nft-gallery/actions/runs/12430119135/job/34704922979 fails on assethub endpoint instance. lets use another endpoint at the moment for ahp
• increase playwright sharding. i assume 1 instance on github actions have 1 ip. increase the sharding to reduce too many request on same instance

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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