Setup OIDC authentication for GH Actions

[cristidas]

• Swapping IAM user based authentication with Open Connect based authentication, for GH Actions
• Where possible, upgrading some actions used in the GH Actions workflows
• Picking up some changes from older PRs that were merged to main instead of dev

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
chainlog-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 15, 2024 7:59am

[DaiFoundation-DevOps]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 4 committers have signed the CLA.

✅ eskp
❌ MakerDAO-DevOps
❌ cristidas
❌ Simon KP

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