fix(go): normalize Go package name for dynamic snippet IR generation

[iamnamananand996]

Description

Fixes Go dynamic snippets not being generated during fern docs publish, causing docs sites to fall back to raw net/http HTTP snippets instead of SDK-idiomatic Go code.

Root Cause

In generateLanguageSpecificDynamicIRs, the snippet configuration's Go package name is normalized via normalizeGoPackageForLookup() (stripping the https:// prefix), but the packageName extracted from the generator's output config (repoUrl) retains the https:// prefix. The strict equality check (===) always fails for Go, so the dynamic IR is never generated and never uploaded to FDR.

• snippetConfiguration.go → github.com/owner/repo (normalized)
• packageName (from generator config) → https://github.com/owner/repo (not normalized)

Changes Made

• Normalize the Go packageName with normalizeGoPackageForLookup() before the comparison, matching how snippetConfiguration.go is already normalized
• Added changelog entry (v4.63.1)

Testing

• Unit tests added/updated — no new tests; this is a runtime code path during docs publish that requires FDR integration
• Lint passes (pnpm run check)

Review Checklist

• Verify the root cause by tracing both sides of the comparison at line ~1234 of publishDocs.ts
• Check whether Swift has the same bug — snippetConfiguration.swift comes from snippetsConfig.swiftSdk?.package (not normalized), while Swift's packageName also comes from repoUrl (with https://). If swiftSdk.package can be a GitHub URL, Swift would have the same mismatch.

Link to Devin session: https://app.devin.ai/sessions/97992dbbc8c7438bbdf2c381765313d1
Requested by: @iamnamananand996

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