Conditionally generate public_attributes.json

What does this MR do?

Conditionally generate public_attributes.json. When skip-auto-reconfigure is set, the file was still being generated, but without the full calculation of attributes. On Patroni node upgrades, this would break gitlab-ctl patroni commands until a full reconfigure was run since the upgrade will run the postgresql-bin recipe without all of the attributes.

Related issues

Closes #6446 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
• trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for the GitLab Chart opened

Test plan

Current state

On a node with patroni enabled:

1. gitlab-ctl patroni members should work
2. Run touch /etc/gitlab/skip-auto-reconfigure
3. Run gitlab-ctl upgrade (to simulate a package upgrade)
4. Running gitlab-ctl patroni members should fail
5. Run gitlab-ctl reconfigure
6. gitlab-ctl patroni members should work again

Expected state

On a node with patroni enabled:

1. gitlab-ctl patroni members should work
2. Run touch /etc/gitlab/skip-auto-reconfigure
3. Run gitlab-ctl upgrade (to simulate a package upgrade)
4. Running gitlab-ctl patroni members should still work