ci: workflow cleanup follow-up

[Mirko-von-Leipzig]

Follow-up fixes to #1678.

1. Step outputs don't natively support multiline strings.
2. GITHUB_TOKEN is required for gh cli.
3. Nicer progress printing ala chatgpt.
4. gh run delete has no --yes flag.
5. Fix pagination as per issue raised by @drahnr in ci: add workflow cleanup #1678 (comment)

Pagination fix proof in example dry-run here, where the dry-run exits after paginating to 112 entries as per the manual total below:

gh run list --limit 1000 \
  --workflow docker-build-check.yml \
  --json databaseId --jq '.[].databaseId' \
| wc -l                                                                               
     112

[drahnr]

A few comments, I did not review the table gen shell setup thoroughly.

[Mirko-von-Leipzig]

@drahnr take a look and see if the functions helped?

[drahnr]

I find that significantly easier to follow