Support changing or removing Jira autolinks

[janhoy]

Previously, autolink_jira entries could only be added, never removed. The autolink directive now treats autolink_jira as the authoritative list of Jira autolinks for the repository:

• Removing an entry from autolink_jira deletes that autolink
• Removing the whole autolink_jira section deletes all Jira autolinks
• Jira autolinks created by other means (e.g. via INFRA ticket) are removed if not in the list; autolinks pointing anywhere else than the ASF Jira are never touched
• If autolink_jira has never been configured (not present in the current nor the previously applied .asf.yaml), nothing happens

Also fixes a bug where autolinks were created without specifying is_alphanumeric, which defaults to true on the GitHub API, making e.g. SOLR-FOO match the autolink. Autolinks are now created with is_alphanumeric=false so only numeric ticket ids (SOLR-123) match, and existing autolinks with the wrong setting are recreated.

Fixes #115

[janhoy]

I hope this can fix an issue seen in this comment apache/solr-mcp#160 (comment) where plain text in a PR comment like solr-mcp, solr-server and solr-backend wrongly gets linked to Solr JIRA. In an earlier version of that repo's .asf.yaml we enabled auto-linking to SOLR but removed it again in apache/solr-mcp@e515705.

As you can see, removing it did not remove the auto-link, which will be fixed by this PR.

Also, this PR will fix the alpha-numeric issue, so that only numeric issue refs will be linked.

I think there may also be another bug regarding case sensitivity - it should not have linked lowercase solr-<num>, should it?

[ppkarwasz]

LGTM

[janhoy]

Thanks for the review @ppkarwasz , anyone wants to merge?

[potiuk]

Sandbox-tested this against my own sandbox repo (rebased onto current main first — the branch predates the --branch flag #127 added to asfyaml-run, so it can't run in the sandbox workflow as-is).

Seeded three autolinks beforehand to cover each branch of the new logic, then applied autolink_jira: [SOLR, LUCENE]:

Seeded	Expected	Result
GH- → github.com (non-ASF)	untouched	✅ still present
STALE- → ASF Jira, not in list	removed	✅ removed
SOLR- → ASF Jira, is_alphanumeric: true	removed and recreated numeric	✅ recreated with is_alphanumeric: false
LUCENE- (not seeded)	created	✅ created, is_alphanumeric: false

Run: https://github.com/potiuk/infrastructure-asfyaml/actions/runs/35316394422

One path I could not exercise: removing autolink_jira entirely relies on previous_yaml, which comes from the /x1/asfyaml cache. That cache doesn't exist in CI or in a sandbox run, so the removal-on-delete case is covered by unit tests only.