Deleting Notion pages takes a very long time, and is prone to breaking in the page deletion step, where we must delete blocks one at a time because Notion does not allow for bulk block deletions. The errors seem to generally just be random Notion internal errors. This is very bad because it leaves go/msp-ops pages in an unusable state.

To try and mitigate, we add several places to blindly retry:

1. At the Notion SDK level, where a config option is available for retrying 429 errors
2. At the "reset page" helper level, where a failure to reset a page will prompt a retry of the whole helper
3. At the "delete blocks" helper level, where individual block deletion failures will be retried

Attempt to mitigate https://linear.app/sourcegraph/issue/CORE-119

While here, I also made some other QOL tweaks:

• Fix timing of sub-tasks in CLI output
• Bump default concurrency to 5 (our retries will handle if this is too aggressive, hopefully)
• Fix a missing space in generated docs

Test plan

sg msp ops generate-handbook-pages