run-test: add regular line break and test count in the dot output

run-test: add regular line break and test count in the dot output

This will make it simpler to follow the actual progress.

The value "75" have been picked as it is smaller or equal to 80 and give a nice
round number.

--- a/tests/run-tests.py	Fri Oct 11 14:37:59 2024 +0200
+++ b/tests/run-tests.py	Sat Oct 12 03:07:52 2024 +0200
@@ -2298,6 +2298,7 @@
         # sense to map it into skip some day.
         self.ignored = []
 
+        self._dot_printed = 0
         self.times = []
         self._firststarttime = None
         # Data stored for the benefit of generating xunit reports.
@@ -2321,6 +2322,9 @@
         """write an item of the "dot" progress"""
         formated = highlight_progress(progress, self.color)
         self.stream.write(formated)
+        self._dot_printed += 1
+        if not self._dot_printed % 75:
+            self.stream.write(f' [{self._dot_printed}]\n'.rjust(8))
         self.stream.flush()
 
     def onStart(self, test):
@@ -2514,7 +2518,7 @@
         loadtest=None,
         showchannels=False,
         *args,
-        **kwargs
+        **kwargs,
     ):
         """Create a new instance that can run tests with a configuration.
 
@@ -3676,7 +3680,7 @@
             usechg=bool(self.options.with_chg or self.options.chg),
             chgdebug=self.options.chg_debug,
             useipv6=useipv6,
-            **kwds
+            **kwds,
         )
         t.should_reload = True
         return t