Upgrade baton-sdk to v0.7.4 and Go to 1.25.2

[gontzess]

Summary

• Upgrade Go version from 1.23.4 to 1.25.2
• Remove toolchain directive
• Upgrade baton-sdk from v0.3.10 to v0.7.4
• Add WithDefaultCapabilitiesConnectorBuilder for capabilities workflow
• Update CredentialOptions to LocalCredentialOptions
• Delete main.yaml (replaced by verify.yaml from baton-admin)

Testing

• go build ./... passes
• go test ./... passes

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