Document decoupling of ApplicationSet controller cmd parameters

[so0k]

Summary

Changes introduced in 2.8.0 by:

• feat(appset): add configurable max reconciliations to appset #13381

decoupled appilicationset.repo.server.plaintext configuration from controller.repo.server.plaintext. This may result in

transport: authentication handshake failed: tls: first record does not look like a TLS handshake

errors in the applicationSetController log after upgrading from 2.7 to 2.8.

Motivation

For some low-effort, in-cluster set ups without TLS an upgrade to 2.8 could break applicationset controller

Proposal

• add docs for ppl upgrading from 2.7 to 2.8 (here
• missing keys into the argocd-cmd-params-cm.yaml sample

[crenshaw-dev]

Thanks for the report! Do you have time for a PR?

[ashish-dua]

Any updates on PR and in which version of argocd Changes will be merged?