Fix superpmi unit test on Alpine (#83372)

`perl` was removed from the Alpine images we use. The superpmi unit
test harness was using `perl` to convert the line endings in the
superpmicollect.sh wrapper script harness from Windows CR/LF format
to Linux/Mac LF format.

It appears this is no longer necessary, as the wrapper scripts appear
to be built in CI during the "Generate tests wrappers" step on Linux
when they will be run on Linux, so they already have the correct line
endings. Remove the call to invoke `perl`.

Fixes #83320

src/tests/JIT/superpmi/superpmicollect.cs

@@ -218,13 +218,11 @@ private static void RunTest(string testName)
                 testName = testName.Replace(".cmd", ".sh");
                 testName = testName.Replace(".bat", ".sh");
 
-                // The way tests are run on Linux, we might need to do some setup. In particular,
-                // if the test scripts are copied from Windows, we need to convert line endings
-                // to Unix line endings, and make the script executable. We can always do this
-                // more than once. This same transformation is done in runtest.sh.
+                // The way tests are run on Linux, we might need to do some setup. It is assumed
+                // that the line endings of the tests wrapper scripts are correct.
+                // We need to make the wrapper script executable.
                 // Review: RunProgram doesn't seem to work if the program isn't a full path.
 
-                RunProgram("/usr/bin/perl", @"-pi -e 's/\r\n|\n|\r/\n/g' " + "\"" + testName + "\"");
                 RunProgram("/bin/chmod", "+x \"" + testName + "\"");
 
                 // Now, figure out how to run the test.