Use = as separator for the test run report

[agriyakhetarpal]

I noticed that the parallel test run summary has been using * as the separator, which feels a bit odd when browsing the full pytest summary, since the rest of the native section headers provided by pytest use = as the separator. This PR changes it to use =. Would this be fine?

I checked the blame while opening this PR, and did not astutely find a reason as to why * was chosen. The terminalreporter was introduced in c37a9ca with * and stayed in subsequent commits, was reorganised in 63ef3b1 to become a section, and kept the same character.

So while * makes it easier to visually distinguish this section in GitHub Actions CI/local terminal logs, I'm not sure if this was a deliberate design choice. Something for consideration, maybe...

[ngoldbaum]

Just to make it a little more clear for me, any chance you can make a before/after comparison for how the test output looks?

I seriously doubt anyone depends on the character we're using here so if = is more consistent it probably makes sense to switch.

[agriyakhetarpal]

Before this change, the test summary looks like (truncated logs):

tests/tests_here.py ·································

=============================== warnings summary ===============================
(warnings here))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
************************** pytest-run-parallel report **************************
All tests were run in parallel! 🎉
====================== 634 passed, 14 warnings in 20.85s =======================

After this change, this will look like:

tests/tests_here.py ·································

=============================== warnings summary ===============================
(warnings here))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
=========================== pytest-run-parallel report =========================
All tests were run in parallel! 🎉
====================== 634 passed, 14 warnings in 20.85s =======================

(The centering might be a little off, I did that manually)

[ngoldbaum]

Makes sense to me. I'm just going to go ahead and merge this. I'd be really really surprised if anyone depended on it.