refactor(kubernetes): convert scale manifest stage to react

[cristhian-castaneda]

Overview

This PR addresses the refactoring of the Scale (Manifest) stage, part of the ongoing effort to transition Kubernetes stages to React. For additional context, please refer to spinnaker/spinnaker#4254

Changes Made

• Refactored Components:
  • The files scaleManifestConfig.html and scaleManifestConfig.controller.ts have been converted into the new components ScaleManifestConfig.tsx and ScaleManifestStageForm.tsx.
  • The file scaleSettingsForm.component.ts has been converted into the new ScaleSettingsForm.tsx component. Note that this component is also used in /manifest/scale/scale.html for the ad-hoc scale form, so it needs to be portable via react2angular until this angular template is converted to React.
  • The scale.controller.ts and scale.html files were adapted to use the new react-based component.

UI Views

Stage Config

Execution Details Sections

Scale Manifest

Execution Details Tasks

Scale form

[mattgogerly]

Been a while since I looked at Angular -> React migration. Is there a reason we're leaving this as an Angular template and not just making it a React component?

[cristhian-castaneda]

Hey Matt, Yes, it has been a while! This PR is part of a broader plan to resume the migration effort incrementally.

Starting with this PR, we're breaking things down to keep reviews easier. I have two additional PRs lined up after this one to migrate the remaining stages listed in the referenced issue (spinnaker/spinnaker#4254). After those, the focus will shift to the Kubernetes infrastructure templates and controllers.

The following PRs might be a bit larger.