Fix incorrect string operations on bytes output of 'ps' subprocess

[parikshittiwari740]

The subprocess to get the current shell name would always return a bytes output. The subsequent string operations on that output would always fail with a TypeError.

~Using subprocess.run() along with its text flag will fix the issue at hand as well as bring the code in-line with python's recommendation of using run for all use cases it can handle. The current use case does not warrant a use for subprocess.communicate()~.

Closes #1754

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: parikshittiwari740 / name: Parikshit Tiwari (7103dcb4450dae595651f22e086a731f21e426b4)
• :white_check_mark: login: JeanChristopheMorinPerso / name: Jean-Christophe Morin (8699a35290545298348d97b15a674c6aa55b583f, 839d5aa84794c7e07bb94e1ce6c790d9c325019f)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 58.39%. Comparing base (a13f7bb) to head (839d5aa). Report is 27 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1765 +/- ## ========================================== - Coverage 58.41% 58.39% -0.02% ========================================== Files 126 126 Lines 17163 17205 +42 Branches 3506 3519 +13 ========================================== + Hits 10025 10047 +22 - Misses 6473 6491 +18 - Partials 665 667 +2 ```

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