refactor LogAndValidateOptions

[dylan-smith]

In gei migrate-repo the function LogAndValidateOptions() had gotten so large that dotnet format was starting to complain if you added anything new to it. Like in this other PR: #589

I refactored it into separate LogOptions() and ValidateOptions() functions, which I think is better even if our linter didn't complain.

This is pre-req work for the lock-repo PR and issue #385

• Did you write/update appropriate tests
• Release notes updated (if appropriate)
• Appropriate logging output
• Issue linked
• Docs updated (or issue created)

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
gei	86%	86%	349	✔
ado2gh	88%	84%	498	✔
bbs2gh	44%	24%	51	❌
Octoshift	92%	78%	696	✔
Summary	88% (4452 / 5068)	80% (953 / 1184)	1594	✔