tests: prepare for a world without whatchanged

Some tests on fast-import run "git whatchanged" without even
checking the output from the command.  It is tempting to remove the
calls altogether since they are not doing anything useful, but they
presumably were added there while the tests were developed to manually
sanity check which paths were touched.

Replace these calls with "git log --raw", which is a rough
equivalent in the more modern Git.

This does not remove "git whatchanged", but we no longer have to
worry about adjusting these places when we eventually do.

Helped-by: Elijah Newren <newren@gmail.com>
[en: log message]
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: gitster

t/t9300-fast-import.sh

@@ -120,7 +120,7 @@ test_expect_success 'A: create pack from stdin' '
 
 	INPUT_END
 	git fast-import --export-marks=marks.out <input &&
-	git whatchanged main
+	git log --raw main
 '
 
 test_expect_success 'A: verify pack' '
@@ -279,7 +279,7 @@ test_expect_success 'A: verify marks import does not crash' '
 	INPUT_END
 
 	git fast-import --import-marks=marks.out <input &&
-	git whatchanged verify--import-marks
+	git log --raw verify--import-marks
 '
 
 test_expect_success 'A: verify pack' '
@@ -652,7 +652,7 @@ test_expect_success 'C: incremental import create pack from stdin' '
 	INPUT_END
 
 	git fast-import <input &&
-	git whatchanged branch
+	git log --raw branch
 '
 
 test_expect_success 'C: verify pack' '
@@ -715,7 +715,7 @@ test_expect_success 'D: inline data in commit' '
 	INPUT_END
 
 	git fast-import <input &&
-	git whatchanged branch
+	git log --raw branch
 '
 
 test_expect_success 'D: verify pack' '
@@ -882,7 +882,7 @@ test_expect_success 'H: deletall, add 1' '
 
 	INPUT_END
 	git fast-import <input &&
-	git whatchanged H
+	git log --raw H
 '
 
 test_expect_success 'H: verify pack' '
@@ -2066,7 +2066,7 @@ test_expect_success 'Q: commit notes' '
 	INPUT_END
 
 	git fast-import <input &&
-	git whatchanged notes-test
+	git log --raw notes-test
 '
 
 test_expect_success 'Q: verify pack' '

t/t9301-fast-import-notes.sh

@@ -76,7 +76,7 @@ INPUT_END
 test_expect_success 'set up main branch' '
 
 	git fast-import <input &&
-	git whatchanged main
+	git log --raw main
 '
 
 commit4=$(git rev-parse refs/heads/main)