Update BBS generate script to accept `--use-github-storage` option

[begonaguereca]

Summary

Things happening in this PR:

1. Add --use-github-storage to the GenerateScript command
2. Update integration tests to use --use-github-storage command

Take it for a 🚗

export GH_PAT=<<PAT>> 

dotnet run --project src/bbs2gh/bbs2gh.csproj -- generate-script --bbs-project IM --ssh-user bbs --ssh-private-key /Users/begonaguereca/.ssh/id_rsa_bbs_octoshift --use-github-storage true --bbs-server-url https://test-bbs-o.githubapp.com --github-org octoshift-staging

• [ ] Did you write/update appropriate tests
• [ ] Release notes updated (if appropriate)
• [ ] Appropriate logging output
• [ ] Issue linked
• [ ] Docs updated (or issue created)
• [ ] New package licenses are added to ThirdPartyNotices.txt (if applicable)

Closes: https://github.ghe.com/github/octoshift/issues/9633

[github-actions[bot]]

Unit Test Results

833 tests   833 ✅  22s ⏱️   1 suites    0 💤   1 files      0 ❌

Results for commit 13c453e3.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
gei	80%	71%	550	✔
ado2gh	84%	78%	627	✔
Octoshift	87%	76%	1298	✔
bbs2gh	79%	74%	680	✔
Summary	84% (7037 / 8425)	75% (1591 / 2110)	3155	✔