Default timeout in showErrorMessage(): [01]s => 5s

The default timeout value was 0 seconds in showErrorMessage() signal of
IStatus and derived classes that override it. The default timeout value
was 1 second in IUiController::showErrorMessage() member function.

In all the three places, where classes derived from IStatus emit this
signal, no timeout is specified, meaning that the error messages were
shown, then hidden in 0 seconds, and so were never actually visible to
the left of the progress bar in the bottom-right corner. The calls to
IUiController's member function never rely on the default timeout value.
However, since both emitting of this signal and calls to this function
are eventually handled by StatusBar::showErrorMessage(), it makes sense
to use the same default timeout value. The user will have a chance to
actually see and read the error message if it is visible for 5 seconds,
while 1 second is probably not long enough for this.

Remove default timeout values from overriden signals that are never
emitted. Some of the derived classes already omit this default value in
overriden signals that are never emitted. Let us increase the number of
such cases. This will make it easier to adjust the default timeout value
in the future. If someone decides to emit one of these signals at some
future time, they can copy the default value from IStatus.

Remove unused timeout parameter from
GrepOutputModel::showErrorMessage(). This signal is connected only to
&GrepOutputView::showErrorMessage slot, which has a single errorMessage
1 job for !157 with overhaul-grepjob-state-transitions in 60 minutes and 1 second (queued for 355 minutes and 52 seconds)
latest detached
Status Job ID Name Coverage
failed #63349
linux kf5-qt5 qt5.12


Name Stage Failure
linux kf5-qt5 qt5.12 Build The script exceeded the maximum execution time set for the job
        Start  76: test_lldb
kf.init.klauncher: new app ":1.41"
kf.init.klauncher: new app "org.kdevelop.kdevplatform-lock-33ac8f56-3d30-4a7a-bd3b-b2f2ecd31445"
76/123 Test #76: test_lldb ............................... Passed 10.69 sec
Start 77: test_lldbformatters
kf.init.klauncher: new app ":1.42"
Uploading artifacts for failed job
Pulling docker image gitlab/gitlab-runner-helper:x86_64-a998cacd ...
ERROR: Job failed: execution took longer than 1h0m0s seconds