fix(vector): use dedicated annotations for headless service

[iarlyy]

Context:
The headless Service template uses service.annotations. This means any annotations set on the main Service leak into the headless Service, which causes conflicts with controllers such as the AWS LBC trying to reconcile a Service with load balancer config.

Proposed changes:

• serviceHeadless gets its own annotations

[pront]

Hi @iarlyy, thank you for the PR. Is this a breaking change for users who currently rely on service.annotations applying to both services?

[iarlyy]

Hi @iarlyy, thank you for the PR. Is this a breaking change for users who currently rely on service.annotations applying to both services?

Hi @pront,

yes, this is a breaking change from the point of view that existing annotations will be removed if the user doesn't define them under the serviceHeadless config, though I don't expect anything around vector itself to be impacted.

Wdyt?