Quadlet - do not link pod service units to quadlet templates

[ygalblum]

When a template container unit is linked to a pod do not add its service to the pod units dependency

Resolves: #27844

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Quadlet - Do not link pod service units to template container service units

[baude]

LGTM

[TomSweeneyRedHat]

LGTM

[TomSweeneyRedHat]

/lgtm

[jankaluza]

LGTM.

I spent time thinking if we should search for @ or @.. The thing is that strictly speaking, template is just foo@.service. If there is a foo@bar.service, it is an instance of that template afaik. The isTemplateUnit currently matches both templates and instances, but I think it is fine in this context.

Just saying that in case someone with more experience with this code would find this an issue.

[ygalblum]

@jankaluza good catch. I've fixed the code. Note that it required reverting part of the change since in the other cases, the check is in fact for "template or an instance of a template".
I've updated the test as well. PTAL

[ygalblum]

BTW is there an issue with the bot? @TomSweeneyRedHat's LGTM did not trigger any labeling (and as a result the PR did not merge already)

[TomSweeneyRedHat]

@ygalblum this is the second time this week the bot has ignored my merge request. @bbaude do you know what's going on?