Remove deprecated methods in vNext

[t1m0thyj]

Proposed changes

Resolves #2238 by removing methods that were deprecated in v2.

Also consolidates VS Code commands to remove duplication.

Release Notes

Milestone: v3

Changelog: Removed deprecated methods and consolidated VS Code commands (see file for more details)

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)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Updates to Documentation or Tests (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This checklist will be used as reference for both the contributor and the reviewer

• [ ] I have read the CONTRIBUTOR GUIDANCE wiki
• [ ] PR title follows Conventional Commits Guidelines
• [ ] PR Description is included
• [ ] gif or screenshot is included if visual changes are made
• [ ] yarn workspace vscode-extension-for-zowe vscode:prepublish has been executed
• [ ] All checks have passed (DCO, Jenkins and Code Coverage)
• [ ] I have added unit test and it is passing
• [ ] I have added integration test and it is passing
• [ ] There is coverage for the code that I have added
• [ ] I have tested it manually and there are no regressions found
• [ ] I have added necessary documentation (if appropriate)
• [ ] Any PR dependencies have been merged and published (if appropriate)

Further comments

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.18919% with 8 lines in your changes missing coverage. Please review.

Project coverage is 92.61%. Comparing base (3364be3) to head (f67d583).

Files	Patch %	Lines
...ges/zowe-explorer/src/trees/dataset/DatasetTree.ts	0.00%	3 Missing :warning:
...kages/zowe-explorer/src/trees/shared/SharedInit.ts	95.91%	2 Missing :warning:
.../zowe-explorer/src/management/ProfileManagement.ts	75.00%	1 Missing :warning:
...es/zowe-explorer/src/trees/shared/SharedActions.ts	0.00%	1 Missing :warning:
packages/zowe-explorer/src/trees/uss/USSActions.ts	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #2931 +/- ## ========================================== - Coverage 92.63% 92.61% -0.03% ========================================== Files 110 110 Lines 11059 10960 -99 Branches 2272 2349 +77 ========================================== - Hits 10245 10151 -94 + Misses 812 807 -5 Partials 2 2 ```

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

Quality Gate failed

Failed conditions
19.9% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud