testament :show duration also for failed tests; improve tshould_not_work; mitigate #17946 tchannels timeouts (#17947)

* refs #17946; refactor testament test summary, show test duration for failures; increase timeout tchannels

* revert workarounds from https://github.com/nim-lang/Nim/pull/16698 and add allowPrefixMatch optional param to greedyOrderedSubsetLines

* add test

* workaround for yet another testament bug

testament/tests/shouldfail/tccodecheck.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   ccodecheck: "baz"
 """
 

testament/tests/shouldfail/tcolumn.nim

@@ -1,6 +1,5 @@
 discard """
   errormsg: "undeclared identifier: 'undeclared'"
-  targets: "c"
   line: 9
   column: 7
 """

testament/tests/shouldfail/terrormsg.nim

@@ -1,6 +1,5 @@
 discard """
   errormsg: "wrong error message"
-  targets: "c"
   line: 9
   column: 6
 """

testament/tests/shouldfail/texitcode1.nim

@@ -1,4 +1,3 @@
 discard """
-  targets: "c"
   exitcode: 1
 """

testament/tests/shouldfail/tfile.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   errormsg: "undeclared identifier: 'undefined'"
   file: "notthisfile.nim"
 """

testament/tests/shouldfail/tline.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   errormsg: "undeclared identifier: 'undeclared'"
   line: 10
   column: 6

testament/tests/shouldfail/tmaxcodesize.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   maxcodesize: 1
 """
 

testament/tests/shouldfail/tnimout.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   nimout: "Hello World!"
   action: compile
 """

testament/tests/shouldfail/tnimoutfull.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   nimout: '''
 msg1
 msg2

testament/tests/shouldfail/toutput.nim

@@ -1,5 +1,4 @@
 discard """
-  targets: "c"
   output: '''
   done
   '''

testament/tests/shouldfail/toutputsub.nim

@@ -1,6 +1,5 @@
 discard """
   outputsub: "something else"
-  targets: "c"
 """
 
 echo "Hello World!"

testament/tests/shouldfail/treject.nim

@@ -1,6 +1,5 @@
 discard """
   action: "reject"
-  targets: "c"
 """
 
 # Because we set action="reject", we expect this line not to compile. But the

testament/tests/shouldfail/tsortoutput.nim

@@ -1,6 +1,5 @@
 discard """
   sortoutput: true
-  targets: "c"
   output: '''
 2
 1

testament/tests/shouldfail/ttimeout.nim

@@ -1,6 +1,5 @@
 discard """
   timeout: "0.1"
-  targets: "c"
 """
 
 import os

testament/tests/shouldfail/tvalgrind.nim

@@ -1,6 +1,5 @@
 discard """
   valgrind: true
-  targets: "c"
   cmd: "nim $target --gc:arc -d:useMalloc $options $file"
 """