chore: Update PR template

[traeok]

Proposed changes

Add new items, update wording for existing items, and remove some redundant items for the pull request template.

Types of changes

What types of changes does your code introduce to Zowe Explorer? Put an x in the boxes that apply

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Updates to Documentation or Tests (if none of the other choices apply)

[JillieBeanSim]

since the 2 are the same, please see further comments on https://github.com/zowe/zowe-explorer-vscode/pull/2955, thanks @traeok

[codecov[bot]]

Codecov Report

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

Project coverage is 93.51%. Comparing base (f0faba4) to head (c78b7ca). Report is 2 commits behind head on main.

:exclamation: Current head c78b7ca differs from pull request most recent head 682e419

Please upload reports for the commit 682e419 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2954 +/- ## ======================================= Coverage 93.51% 93.51% ======================================= Files 104 104 Lines 10895 10895 Branches 2388 2296 -92 ======================================= Hits 10189 10189 Misses 705 705 Partials 1 1 ```

:umbrella: View full report in Codecov by Sentry.
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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud