Ignore draft PRs outside of the project board

[jablko]

All the bot does to draft PRs is remove them from the project board, just like closed PRs:

dt-mergebot/src/pr-info.ts

Lines 188 to 189 in 251e2ba

	if (prInfo.isDraft) return botEnsureRemovedFromProject("PR is a draft");
	if (prInfo.state !== PullRequestState.OPEN) return botEnsureRemovedFromProject("PR is not active");

So the daily script can ignore draft PRs that are already removed from the project board? Handle any exceptions in the --cleanup section, just like closed PRs. Eliminates some unnecessary work by the script and makes the closed/draft cases consistent.

Adding isDraft to the all-open-prs query excludes draft PRs from the main run.ts section. It includes them in the --cleanup section because that checks !cardIDs.includes(), which will now be true:

dt-mergebot/src/run.ts

Line 125 in 251e2ba

const ids = column.cards.map(c => c.id).filter(c => !cardIDs.includes(c));