docs(integrations): update CLI commands to current flags
The integration docs (devel/integrations.md and the plugin READMEs) still show the commands from before #1046/#1051 moved integrations from IDs to names and #1515 made --project required on integration attached add. As written, every attach example fails with required flag(s) "project" not set, available describe --id fails with unknown flag: --id, and the smtp README still uses chainloop workflow integration attach, which no longer exists. The smtp registration example was also missing the required --name, and in devel/integrations.md a # comment line inside the oci-registry backslash continuation ended the command before its --opt lines.
This updates those commands to the current flags, with placeholders in the [name] style the READMEs already use. I ran each changed command against a CLI built from main: they all get past argument and flag validation and stop only at the connection to the control plane. The sample output tables in these docs are older than the commands (for example dependencytrack as an ID) and I left them as they are.
This was written with Claude Code and found by parsing every chainloop ... command in the repo's Markdown with the CLI's own cobra flag sets.