Prepare tests for multiple links in the footer

Including a link showing the owner/group of the file/directory would
make our test fail as the selector becomes ambiguous.

src/files-footer-detail.tsx

@@ -102,6 +102,7 @@ export const FilesFooterDetail = ({
                   variant="link"
                   isInline
                   component="pre"
+                  id="files-footer-permissions"
                 >
                     {permissionShortStr(selectedFile.mode)}
                 </Button>

test/check-application

@@ -330,12 +330,12 @@ class TestFiles(testlib.MachineCase):
         # Change permissions of cwd and see that files-footer-info is updated
         b.go("/files#/?path=/home/admin/newdir")
         self.assert_last_breadcrumb("newdir")
-        b.wait_in_text(".files-footer-info .pf-m-link", "rwx r-x r-x")
+        b.wait_in_text("#files-footer-permissions", "rwx r-x r-x")
         m.execute("chmod 700 /home/admin/newdir")
-        b.wait_in_text(".files-footer-info .pf-m-link", "rwx --- ---")
+        b.wait_in_text("#files-footer-permissions", "rwx --- ---")
 
         # Also check popover
-        b.click(".files-footer-info .pf-m-link")
+        b.click("#files-footer-permissions")
         b.wait_in_text(".pf-v5-c-popover dl div:nth-child(1) > dd", "read, write, and execute")
         b.wait_in_text(".pf-v5-c-popover dl div:nth-child(2) > dd", "none")
         b.wait_in_text(".pf-v5-c-popover dl div:nth-child(3) > dd", "none")
@@ -379,7 +379,7 @@ class TestFiles(testlib.MachineCase):
         # Selecting one file shows its info in the footer
         b.click("[data-item='newdir']")
         b.wait_in_text(".files-footer-info", "newdir")
-        b.wait_in_text(".files-footer-info .pf-m-link", "rwx --- ---")
+        b.wait_in_text("#files-footer-permissions", "rwx --- ---")
 
         # Select multiple files
         m.execute("touch /home/admin/newfile.txt")