Elapsed pipeline time is ticking in Web IDE
### Summary
The time a pipeline is running (displayed in the bottom left corner) is updating every second.
### Steps to reproduce
- start pipeline
- immediately open Web IDE
### What is the current *bug* behavior?
seconds are ticking:

### What is the expected *correct* behavior?
`less than a minute` is shown (see also https://gitlab.com/gitlab-org/gitlab-ce/issues/47976)
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