ci: track Context7 variant by branch (sagitta companion) (#2129)sagitta

Companion to vyos-documentation#2127 (rolling). That PR switched the
Context7 1.5/1.4 variants to branch-backed and moved context7-refresh
to a push trigger, but a push-triggered workflow only fires from the
copy present on the pushed branch. Land the same two workflow changes
on sagitta so pushes here self-refresh the branch variant:

- context7-refresh.yml: workflow_run chain → push trigger on
  rolling/circinus/sagitta; refresh payload uses branch:"sagitta".
- Delete update-version-tags.yml (obsolete — no more git-tag
  indirection; branch variant tracks HEAD natively).

No context7.json on this branch — Context7 reads config only from the
default branch (rolling). Workflow-only change.

🤖 Generated by [robots](https://vyos.io)

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