[kube attach] issue when build script generates long line

Follow up for #4144 (comment 307114638)

Follow up for !1775 (merged)

@ggeorgiev_

When using !1775 (merged) kube attach feature (build: 12.9.0~beta.2447.g0dc24a44), we observe following issue:

When the build pod generates a long line, then the kube-runner is loosing track of the build

WARNING: Error reading log for namespace/runner-xxx-project-xxx-concurrent-xxx/build: bufio.Scanner: token too long. Retrying...

In the background, the build is still ongoing, but you need to manually clean up the runner. I noticed that it happens when we have a really long line of log ... for example when we have a "progess bar".

When this problem happen, we need to kill the pod manually to release the pod. or the pod is waiting forever to have its log dumped.

cancel from UI seems to kill the pod correctly in this state

simple repro yml:

build:
    script:
        - |
            for i in `seq 10 1000 100000`
            do
                echo $i
                for j in `seq $i`
                do
                    echo -n .
                done
                echo
            done
    tags:
        - kube_test

this fails at:

66010
[0;33mWARNING: Error reading log for gitlabci/runner-stgjx2em-project-48753-concurrent-0sml8j/build: bufio.Scanner: token too long. Retrying...

a related weird thing is that the long lines. They have timestamps (like 2020-03-19T14:57:27.491091511Z inserted inside them that appear every 16385 byte):

65010
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