ci: release workflow test job has redundant setup-go step

[jongio]

Problem

In the release workflow's test job, the actions/setup-go step appears twice (lines 90-95 and lines 121-126) with identical configuration. The second invocation is redundant since Go is already set up from the first step.

Location

.github/workflows/release.yml, test job:

• First setup (line 90-95): Sets up Go before running tests
• Second setup (line 121-126): Sets up Go again before cross-platform builds

Both steps use the exact same action, version, and parameters.

Impact

• Adds unnecessary execution time to each release workflow run
• Creates maintenance burden (two places to update if Go setup changes)
• May confuse contributors reading the workflow

Suggested Fix

Remove the second Set up Go step (lines 121-126). The Go toolchain persists across steps within the same job.