test_urls: Use /api instead of /help pages for some tests.

We are going to move the help center to starlight soon and the tests
won't be able to access that help center until we solve things in a
followup issue. We move some of the urls being tested from /help to /api
to not loose coverage on those tests.

zerver/lib/test_helpers.py

@@ -570,6 +570,15 @@ def write_instrumentation_reports(full_suite: bool, include_webhooks: bool) -> N
 
         untested_patterns -= exempt_patterns
 
+        # A lot of help/ URLs are part of the untested patterns, which
+        # is due to the switch to the new help center. We exempt them
+        # programmatically below.
+        untested_patterns = {
+            untested_pattern
+            for untested_pattern in untested_patterns
+            if not untested_pattern.startswith("help/")
+        }
+
         var_dir = "var"  # TODO make sure path is robust here
         fn = os.path.join(var_dir, "url_coverage.txt")
         with open(fn, "wb") as f:
@@ -578,7 +587,7 @@ def write_instrumentation_reports(full_suite: bool, include_webhooks: bool) -> N
         if full_suite:
             print(f"INFO: URL coverage report is in {fn}")
 
-        if full_suite and len(untested_patterns):  # nocoverage -- test suite error handling
+        if full_suite and untested_patterns:  # nocoverage -- test suite error handling
             print("\nERROR: Some URLs are untested!  Here's the list of untested URLs:")
             for untested_pattern in sorted(untested_patterns):
                 print(f"   {untested_pattern}")