Rename spack env branch names in our script

The branch names in the repo spack-environments changed to use the format releases/dev-23a and for the spack fork, it was changed to mpsd/v0.19_dev-23a (see spack-environments!36 (merged) we dont worry about that in this script ) This MR updates those changes into our source.

tests/test_mpsd_software.py

@@ -146,7 +146,7 @@ def test_prepare_environment(tmp_path):
         capture_output=True,
     )
     git_branch_stdout = git_branch_output_raw.stdout.decode("utf-8")
-    assert f"* {mpsd_release_to_test}" in git_branch_stdout
+    assert f"* releases/{mpsd_release_to_test}" in git_branch_stdout
 
     # check that result is a list and contains atleast ['global','foss2021a-mpi']
     assert isinstance(result, list)
@@ -185,7 +185,7 @@ def test_record_script_execution_summary(tmp_path):
     # Check that the log file has "Spack environments branch: dev-23a " in the last line
     with open(root_dir / cmd_log_file, "r") as f:
         last_line = f.readlines()[-1]
-        assert "Spack environments branch: dev-23a " in last_line
+        assert "Spack environments branch: releases/dev-23a" in last_line
 
 
 def test_install_environment_wrong_package_set(tmp_path):