Phase 2 of the go port - generate-script

[offbyone]

This phase is focused on getting generate-script working, as it's the primary interface.

• introduce a validator to ensure that we do not break compatibility with the scripts generated by the dotnet CLI (for now ;) )

• implement a template-based script generator in scriptgen

• Did you write/update appropriate tests

• Release notes updated (if appropriate) — not user-facing yet (parallel Go port)

• Appropriate logging output

• Issue linked — tracking via PR stack

• Docs updated (or issue created)

• New package licenses are added to ThirdPartyNotices.txt (if applicable)

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PR Stack (Go port)

• Go port - phase 1 - base framework #1500 — Phase 1: Base framework
• 👉 Phase 2 of the go port - generate-script #1501 — Phase 2: generate-script (this PR)
• Phase 3: GitHub API client + all shared commands (Go port) #1533 — Phase 3: GitHub API client + shared commands
• Phase 4: Cloud storage clients + archive orchestration + GHES version checker (Go port) #1535 — Phase 4: Cloud storage + archive orchestration + GHES version checker
• Phase 5: gei migrate-repo, migrate-org, alert migration commands (Go port) #1536 — Phase 5: gei migrate-repo, migrate-org, alert migration commands
• Phase 6: ADO API client + all ado2gh commands (Go port) #1537 — Phase 6: ADO API client + all ado2gh commands
• Phase 7: BBS API client + all bbs2gh commands (Go port) #1538 — Phase 7: BBS API client + all bbs2gh commands
• Phase 8: CI/CD workflow updates for Go binaries #1539 — Phase 8: CI/CD workflow updates for Go binaries

[github-actions]

Unit Test Results

    1 files      1 suites   27s ⏱️
1 036 tests 1 036 ✅ 0 💤 0 ❌
1 037 runs  1 037 ✅ 0 💤 0 ❌

Results for commit d245059.

♻️ This comment has been updated with latest results.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
ado2gh	71%	69%	741	➖
Octoshift	83%	73%	1849	✔
gei	81%	73%	608	✔
bbs2gh	83%	78%	667	✔
Summary	81% (7969 / 9888)	73% (1972 / 2693)	3865	✔