Merge bitcoin/bitcoin#30733: test: remove unused src_dir param from run_tests after CMake migration

2ad560139b Remove unused src_dir param from run_tests (Lőrinc)

Pull request description:

  The `src_dir` usage was removed in  a8a2e364ac (diff-437d7f6e9f2229879b60aae574a8217f14c643bbf3cfa9225d8011d6d52df00cL598), making the parameter unused.

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Tree-SHA512: 1fd8b93811b4ab467ba5a160a4fe204e9606e1bf237c7595ed6f8b7821cf59d2a776c0e1e154852a45b2a35e5bdbd8996314e4f63a9c750f21b9a17875cb636a

test/functional/test_runner.py

@@ -569,7 +569,6 @@ def main():
 
     run_tests(
         test_list=test_list,
-        src_dir=config["environment"]["SRCDIR"],
         build_dir=config["environment"]["BUILDDIR"],
         tmpdir=tmpdir,
         jobs=args.jobs,
@@ -581,7 +580,7 @@ def main():
         results_filepath=results_filepath,
     )
 
-def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=False, args=None, combined_logs_len=0, failfast=False, use_term_control, results_filepath=None):
+def run_tests(*, test_list, build_dir, tmpdir, jobs=1, enable_coverage=False, args=None, combined_logs_len=0, failfast=False, use_term_control, results_filepath=None):
     args = args or []
 
     # Warn if bitcoind is already running
@@ -604,7 +603,7 @@ def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=
         print(f"{BOLD[1]}WARNING!{BOLD[0]} There may be insufficient free space in {tmpdir} to run the Bitcoin functional test suite. "
               f"Running the test suite with fewer than {min_space // (1024 * 1024)} MB of free space might cause tests to fail.")
 
-    tests_dir = build_dir + '/test/functional/'
+    tests_dir = f"{build_dir}/test/functional/"
     # This allows `test_runner.py` to work from an out-of-source build directory using a symlink,
     # a hard link or a copy on any platform. See https://github.com/bitcoin/bitcoin/pull/27561.
     sys.path.append(tests_dir)