tests: replace remaining CR bytes with the new macro %CR

There is no more mixed-newline file in the repository after this patch.
Except for`.bat` and `.sln` files (4 in total), all files use LF
newlines.

Also:
- `spacecheck.pl`: drop mixed-EOL exception for test data.
- runtests: add option `-w` to check if test data has stray CR bytes in
  them.
- build: enable the option above in test targets, except the CI-specific
  one where `spacecheck.pl` does this job already.
- tested OK (with expected failures) in CI with stray CRs added.
- cmake: enable option `-a` for the `tests` target. To continue testing
  after a failed test.

Follow-up to 63e9721b63 #19313
Follow-up to 6cf3d7b1b1 #19318
Follow-up to 4d2a05d3fe #19284

Closes #19347

.github/scripts/spacecheck.pl

@@ -34,10 +34,6 @@ my @tabs = (
     "^tests/data/test",
 );
 
-my @mixed_eol = (
-    "^tests/data/test",
-);
-
 my @need_crlf = (
     "\\.(bat|sln)\$",
 );
@@ -109,8 +105,7 @@ while(my $filename = <$git_ls_files>) {
 
     my $eol = eol_detect($content);
 
-    if($eol eq "" &&
-        !fn_match($filename, @mixed_eol)) {
+    if($eol eq "") {
         push @err, "content: has mixed EOL types";
     }
 
@@ -120,8 +115,7 @@ while(my $filename = <$git_ls_files>) {
     }
 
     if($eol ne "lf" && $content ne "" &&
-        !fn_match($filename, @need_crlf) &&
-        !fn_match($filename, @mixed_eol)) {
+        !fn_match($filename, @need_crlf)) {
         push @err, "content: must use LF EOL for this file type";
     }