Refactor revision dropdown translation text

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The following discussion from !52967 (merged) should be addressed:

• @jivanvl started a discussion:

  Suggestion (optional) I noticed there's a fair bit of translations happening for this file, a pattern that we find useful in CI is to consolidate all of the strings marked for translation inside a custom option, an example of this pattern can be seen in this file

  https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/assets/javascripts/threat_monitoring/components/policy_editor/policy_alert_picker.vue#L7