Describe your changes

I've added a couple of things to allow a custom jira template be used for postmortems.

integrations:
  confluence:
    postmortem_template_id: 163984

By setting the postmortem_template_id, the template will be fetched and updated in a fashion similar to jinja. Text on the page (including the title) will be replaced if it matches a variable in the context.

class PostmortemContext(TypedDict):
    incident_id: str
    incident_commander: str | None
    severity: str | None
    severity_definition: str | None
    timeline_table_html: str | None
    pinned_messages_html: str | None
    author: str | None
    incident_date: str | None
    postmortem_date: str | None
    roles_html: str | None
    description: str | None
    channel_link: str | None

• This change also creates the links from slack users -> confluence users within the post mortem.
• Slack user emails are now fetched and stored in opsdata, this requires a manifest update / app reinstallation to work.

Issue number and link

Closes #419.

Checklist before requesting a review

• I have properly bumped all version refs by running ./scripts/version-bump.sh v<new> from project root - for example ./scripts/version-bump.sh v1.9.3 (I'll do this after the review)