Resolve technical debt in job_log_controllers.vue
Resolve technical debt in `app/assets/javascripts/jobs/components/job_log_controllers.vue`
- `jobLogSize` should use `GlSprintf` since the string is in the template not passed as a prop value
- Use gitlab utility classes where possible
- Replace `v-html` for scroll down button
- Remove `js-scroll-bottom` unused class
- Determine if we still need to polyfill `position: sticky`
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