Revert "Add esbuild frontend jobs to CI"

What does this MR do and why?

This MR reverts Add esbuild frontend jobs to CI (!113953 - merged) because:

1. These jobs create an illusion that the pipeline has failed while before it was fully green (now it is not)
2. The jobs themselves are broken and never complete successfully (issue to fix: Fix and optimise frontend assets esbuild compil... (#397667 - closed))
3. We're wasting resources here by doing meaningless work (we can't estimate whether the esloader build actually passes or not right now)

Since the estimate of Fix and optimise frontend assets esbuild compil... (#397667 - closed) is unknown we should revert the original change first, fix the jobs and then re-introduce them with a new MR.