[AC-1743] Operation Upgrade Directory Connector's Dependencies

[addisonbeck]

This issue will track several PRs related to upgrading Directory Connector's dependencies. It is sorted in a recommended review order that will (hopefully) produce minimal conflicts.

Prep work

• [AC-1743] pt. 1: Unpackage-ify jslib #374
• AC-1743 pt. 1.5: Remove package.json from src #395
• [AC-1743] pt. 2: Update eslintrc and fix any errors #393
• [AC-1743] pt. 2.5 ⮕ Fix the unit tests for good #398

Remove Unused Dependencies

• [AC-1743] pt. 3 ⮕ Remove unused packages #399
• Tools - Remove importer and exporters #402

Bulk Bump All Patch & Minor Versions:

• [AC-1743] pt. 4 ⮕ Perform Patch Upgrades #400
• [AC-1743] pt. 5 ⮕ Perform Minor Upgrades #401

Major Version Uprades:

• Upgrade dotenv (v9.0.2 ⮕ v16.4.1)  #411
• Upgrade lint-staged (v12.5.0 ⮕ v15.2.0) #412
• Upgrade html-loader (v3.1.2 ⮕ v5.0.0) #413
• Upgrade sass-loader (v12.6.0 ⮕ v14.0.0) #414
• Upgrade copy-webpack-plugin (v11.0.0 ⮕ v12.0.2)  #415
• Upgrade typescript-transform-paths (v2.2.4 ⮕ v3.4.6) #416
• Upgrade commander (v7.2.0 ⮕ v11.1.0) #410
• Upgrade electron & friends (v18.3.15 ⮕ v28.2.0) #418
• Upgrade prettier (v2.8.8 ⮕ v3.2.2) #409
• Upgrade angular & friends (v15.2.9 ⮕ v16.2.12) #424

Blocked / Not Ready PRs

Pending changes

• Upgrade node (v~18 ⮕ v20.11.0) #417

Notes for testing

• This change is going to need a test of upgrade path. We may need to coordinate the best way to do that.
• Authentication & guards are impacted by the Angular update, and this should also be an interest to testing.