Remove unused jira_upgrade_cta.vue and upgradePlanPath prop
What does this MR do and why?
Follow-up of !86897 (merged) to avoid bloating that MR too much.
Changelog not needed as only includes code changes.
Screenshots or screen recordings
No changes to UI.
How to set up and validate locally
Go to Project > Integrations > Jira. For example, http://127.0.0.1:3000/gitlab-org/gitlab-shell/-/integrations/jira/edit
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MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #361751 (closed)